Merge remote-tracking branch 'origin/blitz/spawn-v2' into spawn-v2/63-tui-draft-pane

forward_to_session dropped Paste(_) on the floor, so pastes into a
session vanished once terminal.rs enabled bracketed paste. Split the
arm: Paste forwards the payload verbatim (the remote readline
reassembles it), only Mouse events have no wire encoding.

crates/maestro-tui/src/action.rs

@@ -38,7 +38,7 @@ pub enum Action {
     // Catalog actions on the highlighted sidebar row
     AttachHighlighted,
     ToggleAttachHighlighted,
-    OpenSpawnModal,
+    NewDraftPane,
     KillHighlighted,
 
     // Tabs
@@ -78,7 +78,7 @@ impl Action {
             "SidebarPrev" => return Ok(Action::SidebarPrev),
             "AttachHighlighted" => return Ok(Action::AttachHighlighted),
             "ToggleAttachHighlighted" => return Ok(Action::ToggleAttachHighlighted),
-            "OpenSpawnModal" => return Ok(Action::OpenSpawnModal),
+            "NewDraftPane" => return Ok(Action::NewDraftPane),
             "KillHighlighted" => return Ok(Action::KillHighlighted),
             "NewTab" => return Ok(Action::NewTab),
             "CloseTab" => return Ok(Action::CloseTab),
@@ -202,6 +202,7 @@ mod tests {
         for a in [
             Action::EnterInsert,
             Action::Quit,
+            Action::NewDraftPane,
             Action::FocusPane(Direction::Right),
             Action::GotoTab(7),
         ] {
@@ -209,4 +210,14 @@ mod tests {
             assert_eq!(Action::parse(&s).unwrap(), a, "round-trip for {a:?}");
         }
     }
+
+    /// The spawn modal is gone (issue #63); its old action string must not
+    /// resolve to anything.
+    #[test]
+    fn the_removed_spawn_modal_action_no_longer_parses() {
+        assert_eq!(
+            Action::parse("OpenSpawnModal").unwrap_err(),
+            ActionParseError::Unknown("OpenSpawnModal".into())
+        );
+    }
 }

crates/maestro-tui/src/app.rs

@@ -6,9 +6,9 @@
 //! changes, and a 30Hz heartbeat.
 //!
 //! Actions mutate `AppState` directly. Side effects that talk to the daemon
-//! (`AttachHighlighted` spawning a `SessionTask`, `OpenSpawnModal` submit
-//! firing a POST, `KillHighlighted` confirm firing a DELETE) live inline in
-//! `dispatch` / `handle_overlay_input`.
+//! (`AttachHighlighted` spawning a `SessionTask`, a draft-pane submit firing
+//! a POST, `KillHighlighted` confirm firing a DELETE) live inline in
+//! `dispatch` / the Insert-mode pane routing.
 
 use std::collections::{HashMap, HashSet};
 use std::io::Stdout;
@@ -24,15 +24,16 @@ use uuid::Uuid;
 use crate::action::Action;
 use crate::catalog::CatalogStore;
 use crate::config::TuiConfig;
+use crate::draft::DraftInputResult;
 use crate::emulators::SessionEmulators;
 use crate::input::{canonicalise, ChordResult, ChordState, ClickTracker, InputKey};
 use crate::keymap::Mode;
-use crate::overlays::{HelpOverlay, SpawnModal};
+use crate::overlays::HelpOverlay;
 use crate::pane::{Pane, PaneStatus};
 use crate::render::{draw, RegionMap, RenderInputs};
 use crate::session_task::{SessionInput, SessionTask};
 use crate::sidebar::Sidebar;
-use crate::state::{AppState, Focus, OverlayKind};
+use crate::state::{AppState, Focus, OverlayKind, PaneRef};
 use crate::tabs::TabBar;
 use crate::TuiError;
 
@@ -49,7 +50,6 @@ pub struct App {
     catalog: CatalogStore,
     emulators: SessionEmulators,
     state: AppState,
-    spawn: SpawnModal,
     help: HelpOverlay,
     chord: ChordState,
     daemon: DaemonClient,
@@ -90,7 +90,6 @@ impl App {
             catalog,
             emulators: SessionEmulators::default(),
             state: AppState::new(),
-            spawn: SpawnModal::default(),
             help,
             chord: ChordState::new(chord_timeout),
             daemon,
@@ -152,7 +151,15 @@ impl App {
                     self.perform(effects).await;
                 } else if self.state.mode == Mode::Insert && matches!(self.state.focus, Focus::Pane)
                 {
-                    if let Some(effect) = self.forward_to_session(&key) {
+                    // Insert mode over a focused pane: a draft eats the key
+                    // into its form, a session gets the raw bytes.
+                    let effect = if matches!(self.state.active_tab().pane, Some(PaneRef::Draft(_)))
+                    {
+                        self.handle_draft_input(&key)
+                    } else {
+                        self.forward_to_session(&key)
+                    };
+                    if let Some(effect) = effect {
                         self.perform(vec![effect]).await;
                     }
                 }
@@ -179,27 +186,7 @@ impl App {
     }
 
     fn handle_overlay_input(&mut self, key: &InputKey) -> (OverlayDecision, Vec<Effect>) {
-        use crate::overlays::SpawnInputResult;
         match self.state.overlay().cloned() {
-            Some(OverlayKind::Spawn) => {
-                let mut effects = Vec::new();
-                match self.spawn.on_input(key) {
-                    SpawnInputResult::Consumed => {}
-                    SpawnInputResult::Cancel => {
-                        self.state.dismiss_overlay();
-                    }
-                    SpawnInputResult::Submit => {
-                        effects.push(Effect::Spawn(CreateSessionRequest {
-                            cwd: std::path::PathBuf::from(self.spawn.cwd.value().to_string()),
-                            command: self.spawn.command.value().to_string(),
-                            env: Default::default(),
-                            metadata: Default::default(),
-                            worktree: None,
-                        }));
-                    }
-                }
-                (OverlayDecision::Consumed, effects)
-            }
             Some(OverlayKind::KillConfirm(id)) => match key {
                 InputKey::Char { c: 'y', .. } => {
                     self.state.dismiss_overlay();
@@ -265,14 +252,7 @@ impl App {
                 };
                 self.state.show_overlay(OverlayKind::Help);
             }
-            Action::OpenSpawnModal => {
-                self.spawn = SpawnModal {
-                    cwd: Default::default(),
-                    command: Default::default(),
-                    focused_field: Default::default(),
-                };
-                self.state.show_overlay(OverlayKind::Spawn);
-            }
+            Action::NewDraftPane => self.state.open_draft_pane(),
             Action::AttachHighlighted | Action::ToggleAttachHighlighted => {
                 if let Some(sid) = self.pick_sidebar_target() {
                     effects.push(Effect::Attach(sid));
@@ -322,44 +302,38 @@ impl App {
     /// Encode a keystroke for the focused pane. `None` when there is nothing
     /// attached to send it to.
     fn forward_to_session(&mut self, key: &InputKey) -> Option<Effect> {
-        let sid = self.state.active_tab().pane?;
+        let sid = self.state.active_session()?;
         self.emulators.get(sid)?;
-        let bytes = match key {
-            InputKey::Char { c, ctrl, alt, .. } => {
-                let mut out = Vec::with_capacity(8);
-                if *alt {
-                    out.push(0x1b);
-                }
-                if *ctrl && c.is_ascii_alphabetic() {
-                    out.push((c.to_ascii_uppercase() as u8) - b'@');
-                } else {
-                    let mut b = [0u8; 4];
-                    let s = c.encode_utf8(&mut b);
-                    out.extend_from_slice(s.as_bytes());
-                }
-                out
-            }
-            InputKey::Enter => b"\r".to_vec(),
-            InputKey::Tab => b"\t".to_vec(),
-            InputKey::BackTab => b"\x1b[Z".to_vec(),
-            InputKey::Backspace => vec![0x7f],
-            InputKey::Esc => vec![0x1b],
-            InputKey::Up => b"\x1b[A".to_vec(),
-            InputKey::Down => b"\x1b[B".to_vec(),
-            InputKey::Right => b"\x1b[C".to_vec(),
-            InputKey::Left => b"\x1b[D".to_vec(),
-            InputKey::Home => b"\x1b[H".to_vec(),
-            InputKey::End => b"\x1b[F".to_vec(),
-            InputKey::Delete => b"\x1b[3~".to_vec(),
-            InputKey::Paste(_) | InputKey::Mouse { .. } => return None,
-        };
+        let bytes = encode_key(key)?;
         Some(Effect::Forward { id: sid, bytes })
     }
 
+    /// Feed one keystroke into the active tab's draft form. Returns the spawn
+    /// effect when the user accepted the form.
+    fn handle_draft_input(&mut self, key: &InputKey) -> Option<Effect> {
+        let PaneRef::Draft(draft) = self.state.active_tab_mut().pane.as_mut()? else {
+            return None;
+        };
+        if draft.on_input(key) != DraftInputResult::Submit {
+            return None;
+        }
+        Some(Effect::Spawn(CreateSessionRequest {
+            cwd: std::path::PathBuf::from(draft.cwd.value().to_string()),
+            command: draft.command.value().to_string(),
+            env: Default::default(),
+            metadata: Default::default(),
+            worktree: None,
+        }))
+    }
+
     async fn submit_spawn(&mut self, req: CreateSessionRequest) {
         match self.daemon.create_session(&req).await {
-            Ok(_) => {
-                self.state.dismiss_overlay();
+            Ok(session) => {
+                // Fill the pane in place with the new session (web parity,
+                // #57) and attach to it right away.
+                let sid = session.id;
+                self.state.complete_spawn(sid);
+                self.attach(sid);
             }
             Err(e) => self.state.toast(format!("spawn failed: {e}")),
         }
@@ -377,7 +351,12 @@ impl App {
         terminal: &mut Terminal<CrosstermBackend<Stdout>>,
     ) -> Result<(), TuiError> {
         let snap = self.catalog.snapshot();
-        let attached: HashSet<Uuid> = self.state.tabs.iter().filter_map(|t| t.pane).collect();
+        let attached: HashSet<Uuid> = self
+            .state
+            .tabs
+            .iter()
+            .filter_map(crate::state::Tab::session)
+            .collect();
         let sidebar = Sidebar {
             sessions: snap.sessions.clone(),
             highlight: self.state.sidebar_highlight,
@@ -387,7 +366,7 @@ impl App {
             tab_names: self.state.tabs.iter().map(|t| t.name.clone()).collect(),
             active_idx: self.state.active_tab_idx,
         };
-        let active_sid = self.state.active_tab().pane;
+        let active_sid = self.state.active_session();
         let pane = active_sid.and_then(|sid| {
             self.emulators.get(sid).map(|h| Pane {
                 screen: h.screen.clone(),
@@ -395,13 +374,17 @@ impl App {
                 focused: matches!(self.state.focus, Focus::Pane),
             })
         });
+        let draft = match self.state.active_tab().pane.as_ref() {
+            Some(PaneRef::Draft(d)) => Some(d),
+            _ => None,
+        };
 
         let inputs = RenderInputs {
             sidebar: &sidebar,
             tab_bar: &tab_bar,
             pane: pane.as_ref(),
             state: &self.state,
-            spawn: &self.spawn,
+            draft,
             help: &self.help,
         };
 
@@ -449,6 +432,43 @@ fn visible_sidebar_order(snap: &crate::catalog::CatalogSnapshot) -> Vec<Uuid> {
     snap.sessions.iter().map(|s| s.id).collect()
 }
 
+/// Wire encoding for a keystroke headed to a session's PTY. `None` for keys
+/// with no byte representation (mouse events). A bracketed paste is forwarded
+/// verbatim — the remote readline reassembles it, since the pane's PTY also
+/// has bracketed paste enabled.
+fn encode_key(key: &InputKey) -> Option<Vec<u8>> {
+    match key {
+        InputKey::Char { c, ctrl, alt, .. } => {
+            let mut out = Vec::with_capacity(8);
+            if *alt {
+                out.push(0x1b);
+            }
+            if *ctrl && c.is_ascii_alphabetic() {
+                out.push((c.to_ascii_uppercase() as u8) - b'@');
+            } else {
+                let mut b = [0u8; 4];
+                let s = c.encode_utf8(&mut b);
+                out.extend_from_slice(s.as_bytes());
+            }
+            Some(out)
+        }
+        InputKey::Enter => Some(b"\r".to_vec()),
+        InputKey::Tab => Some(b"\t".to_vec()),
+        InputKey::BackTab => Some(b"\x1b[Z".to_vec()),
+        InputKey::Backspace => Some(vec![0x7f]),
+        InputKey::Esc => Some(vec![0x1b]),
+        InputKey::Up => Some(b"\x1b[A".to_vec()),
+        InputKey::Down => Some(b"\x1b[B".to_vec()),
+        InputKey::Right => Some(b"\x1b[C".to_vec()),
+        InputKey::Left => Some(b"\x1b[D".to_vec()),
+        InputKey::Home => Some(b"\x1b[H".to_vec()),
+        InputKey::End => Some(b"\x1b[F".to_vec()),
+        InputKey::Delete => Some(b"\x1b[3~".to_vec()),
+        InputKey::Paste(text) => Some(text.as_bytes().to_vec()),
+        InputKey::Mouse { .. } => None,
+    }
+}
+
 /// Build the lines shown by the help overlay from the live keymap, so the
 /// user always sees the bindings that are actually active (defaults + their
 /// own `[tui.keymap.*]` overrides).
@@ -516,10 +536,33 @@ mod tests {
     }
 
     #[test]
-    fn open_spawn_modal_sets_overlay() {
+    fn new_draft_pane_opens_a_focused_draft_in_the_empty_tab() {
         let mut app = make_app();
-        app.dispatch(Action::OpenSpawnModal);
-        assert!(matches!(app.state.overlay(), Some(OverlayKind::Spawn)));
+        app.dispatch(Action::NewDraftPane);
+        assert!(matches!(
+            app.state.active_tab().pane,
+            Some(PaneRef::Draft(_))
+        ));
+        assert_eq!(app.state.focus, Focus::Pane);
+        assert_eq!(app.state.mode, Mode::Insert);
+        assert!(app.state.overlay().is_none(), "no overlay involved");
+    }
+
+    /// A tab already showing a session gets a new tab for the draft.
+    #[test]
+    fn new_draft_pane_over_a_session_opens_a_new_tab() {
+        let sid = Uuid::from_u128(10);
+        let mut app = app_with_highlighted_session(sid);
+        app.dispatch(Action::AttachHighlighted);
+
+        app.dispatch(Action::NewDraftPane);
+        assert_eq!(app.state.tabs.len(), 2);
+        assert_eq!(app.state.active_tab_idx, 1);
+        assert!(matches!(
+            app.state.active_tab().pane,
+            Some(PaneRef::Draft(_))
+        ));
+        assert_eq!(app.state.tabs[0].session(), Some(sid));
     }
 
     /// Seed the catalog with one session and highlight it.
@@ -554,7 +597,7 @@ mod tests {
             app.dispatch(Action::AttachHighlighted),
             vec![Effect::Attach(sid)]
         );
-        assert_eq!(app.state.active_tab().pane, Some(sid));
+        assert_eq!(app.state.active_tab().session(), Some(sid));
     }
 
     #[test]
@@ -587,23 +630,35 @@ mod tests {
     }
 
     #[test]
-    fn submitting_the_spawn_modal_carries_the_typed_fields() {
+    fn typing_into_the_draft_then_enter_carries_the_typed_fields() {
         let mut app = make_app();
-        app.dispatch(Action::OpenSpawnModal);
-        app.spawn.cwd = crate::text_input::TextInput::with_value("/srv/work");
-        app.spawn.command = crate::text_input::TextInput::with_value("claude");
-        app.spawn.focused_field = crate::overlays::SpawnField::Submit;
+        app.dispatch(Action::NewDraftPane);
 
-        let (_, effects) = app.handle_overlay_input(&InputKey::Enter);
-        match effects.as_slice() {
-            [Effect::Spawn(req)] => {
+        for c in "/srv/work".chars() {
+            app.handle_draft_input(&InputKey::char(c));
+        }
+        app.handle_draft_input(&InputKey::Tab); // cwd → command
+        for c in "claude".chars() {
+            app.handle_draft_input(&InputKey::char(c));
+        }
+        app.handle_draft_input(&InputKey::Tab); // command → submit
+
+        match app.handle_draft_input(&InputKey::Enter) {
+            Some(Effect::Spawn(req)) => {
                 assert_eq!(req.cwd, std::path::PathBuf::from("/srv/work"));
                 assert_eq!(req.command, "claude");
             }
-            other => panic!("expected one Spawn effect, got {other:?}"),
+            other => panic!("expected a Spawn effect, got {other:?}"),
         }
     }
 
+    /// Keys fed while no draft exists must be ignored, not panic.
+    #[test]
+    fn draft_input_is_a_no_op_without_a_draft() {
+        let mut app = make_app();
+        assert!(app.handle_draft_input(&InputKey::char('x')).is_none());
+    }
+
     /// Regression: `Toast` returned `Pass` and nothing ever cleared it, so a
     /// failure message stayed on screen until another overlay replaced it.
     #[test]
@@ -632,6 +687,37 @@ mod tests {
         assert!(app.forward_to_session(&InputKey::Enter).is_none());
     }
 
+    /// A draft pane is not a session: forwarding must not try to reach it.
+    #[test]
+    fn forwarding_is_a_no_op_with_a_draft_pane() {
+        let mut app = make_app();
+        app.dispatch(Action::NewDraftPane);
+        assert!(app.forward_to_session(&InputKey::Enter).is_none());
+    }
+
+    /// Regression review fix: `Paste(_)` used to be silently dropped, so a
+    /// paste into an attached session vanished once bracketed paste was
+    /// enabled — the payload must be forwarded verbatim.
+    #[test]
+    fn a_bracketed_paste_is_forwarded_verbatim_to_the_session() {
+        assert_eq!(
+            encode_key(&InputKey::Paste("cd /tmp/foo".into())),
+            Some(b"cd /tmp/foo".to_vec())
+        );
+    }
+
+    #[test]
+    fn mouse_events_have_no_wire_encoding() {
+        use crate::input::{MouseKind, Region};
+        assert!(encode_key(&InputKey::Mouse {
+            kind: MouseKind::Click,
+            region: Region::Pane,
+            col: 3,
+            row: 4,
+        })
+        .is_none());
+    }
+
     #[test]
     fn kill_highlighted_opens_confirm() {
         use chrono::Utc;

crates/maestro-tui/src/config.rs

@@ -45,7 +45,7 @@ const DEFAULT_NORMAL: &[(&str, &str)] = &[
     ("up", "SidebarPrev"),
     // Catalog actions
     ("enter", "AttachHighlighted"),
-    ("s", "OpenSpawnModal"),
+    ("s", "NewDraftPane"),
     ("x", "KillHighlighted"),
     // Tabs
     ("ctrl-t", "NewTab"),
@@ -155,6 +155,10 @@ mod tests {
             cfg.keymap.resolve(Mode::Normal, "g t"),
             Some(Action::NextTab),
         );
+        assert_eq!(
+            cfg.keymap.resolve(Mode::Normal, "s"),
+            Some(Action::NewDraftPane),
+        );
     }
 
     #[test]

crates/maestro-tui/src/draft.rs

@@ -0,0 +1,272 @@
+//! Draft pane — the spawn form living in an ordinary pane (issue #63).
+//!
+//! An empty pane renders a [`DraftPane`] instead of nothing; submitting hands
+//! the caller a built request and the pane is replaced with the new session,
+//! matching the web client's inline draft panes (#57). Field editing goes
+//! through [`crate::text_input::TextInput`]; Tab / BackTab walk the fields.
+//!
+//! Scope note: presets, the project list, generated names, and the worktree
+//! section land with issues #64/#65 — this is cwd + command only.
+
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph};
+use ratatui::Frame;
+
+use crate::input::InputKey;
+
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+pub enum DraftField {
+    #[default]
+    Cwd,
+    Command,
+    Submit,
+}
+
+#[derive(Debug, Default, Clone, PartialEq, Eq)]
+pub struct DraftPane {
+    pub cwd: crate::text_input::TextInput,
+    pub command: crate::text_input::TextInput,
+    pub focused_field: DraftField,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum DraftInputResult {
+    Consumed,
+    Submit,
+}
+
+impl DraftPane {
+    pub fn next_field(&mut self) {
+        self.focused_field = match self.focused_field {
+            DraftField::Cwd => DraftField::Command,
+            DraftField::Command => DraftField::Submit,
+            DraftField::Submit => DraftField::Cwd,
+        };
+    }
+
+    pub fn prev_field(&mut self) {
+        self.focused_field = match self.focused_field {
+            DraftField::Cwd => DraftField::Submit,
+            DraftField::Command => DraftField::Cwd,
+            DraftField::Submit => DraftField::Command,
+        };
+    }
+
+    /// Handle one keystroke while this draft owns input (Insert mode, pane
+    /// focused). Returns [`DraftInputResult::Submit`] when the user accepts;
+    /// the caller fires the POST and replaces the draft with the session.
+    pub fn on_input(&mut self, key: &InputKey) -> DraftInputResult {
+        match key {
+            InputKey::Tab => {
+                self.next_field();
+                DraftInputResult::Consumed
+            }
+            InputKey::BackTab => {
+                self.prev_field();
+                DraftInputResult::Consumed
+            }
+            InputKey::Enter => match self.focused_field {
+                DraftField::Submit => DraftInputResult::Submit,
+                _ => {
+                    self.next_field();
+                    DraftInputResult::Consumed
+                }
+            },
+            // Everything else — characters, motion, editing, paste — goes to
+            // the focused field's text input.
+            other => {
+                match self.focused_field {
+                    DraftField::Cwd => self.cwd.handle_key(other),
+                    DraftField::Command => self.command.handle_key(other),
+                    DraftField::Submit => {}
+                }
+                DraftInputResult::Consumed
+            }
+        }
+    }
+
+    /// Draw into the pane area. `pane_focused` gates the field highlight and
+    /// cursor placement the same way a session pane hides its cursor when
+    /// unfocused.
+    pub fn render(&self, f: &mut Frame, area: Rect, pane_focused: bool) {
+        let block = Block::default().title(" draft ").borders(Borders::ALL);
+        let inner = block.inner(area);
+        f.render_widget(block, area);
+        let rows = Layout::vertical([
+            Constraint::Length(2),
+            Constraint::Length(2),
+            Constraint::Length(1),
+        ])
+        .split(inner);
+
+        let style_for = |field: DraftField| {
+            if pane_focused && self.focused_field == field {
+                Style::default().add_modifier(Modifier::REVERSED)
+            } else {
+                Style::default()
+            }
+        };
+
+        // Each text field renders through the shared `TextInput`, which
+        // handles horizontal scrolling and reports where the terminal cursor
+        // belongs. Label is fixed-width 8 chars + 1 space = column 9.
+        let label = |text: &str| Paragraph::new(Line::from(Span::raw(format!("{text:8} "))));
+        f.render_widget(label("cwd:"), rows[0]);
+        f.render_widget(label("command:"), rows[1]);
+        let draw_field =
+            |f: &mut Frame, input: &crate::text_input::TextInput, row: Rect, style: Style| -> u16 {
+                let area = Rect {
+                    x: row.x.saturating_add(9),
+                    y: row.y,
+                    width: row.width.saturating_sub(9),
+                    height: 1,
+                };
+                input.render(area, f.buffer_mut(), style)
+            };
+        let cwd_col = draw_field(f, &self.cwd, rows[0], style_for(DraftField::Cwd));
+        let cmd_col = draw_field(f, &self.command, rows[1], style_for(DraftField::Command));
+
+        f.render_widget(
+            Paragraph::new(Line::from(vec![Span::styled(
+                "[ Spawn ]",
+                style_for(DraftField::Submit),
+            )])),
+            rows[2],
+        );
+
+        if pane_focused {
+            match self.focused_field {
+                DraftField::Cwd => f.set_cursor_position((cwd_col, rows[0].y)),
+                DraftField::Command => f.set_cursor_position((cmd_col, rows[1].y)),
+                DraftField::Submit => {
+                    // The submit button is indicated by the REVERSED style; no
+                    // cursor placement.
+                }
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use ratatui::backend::TestBackend;
+    use ratatui::Terminal;
+
+    fn render_to_string(w: u16, h: u16, draw: impl FnOnce(&mut Frame)) -> String {
+        let backend = TestBackend::new(w, h);
+        let mut terminal = Terminal::new(backend).unwrap();
+        terminal.draw(draw).unwrap();
+        let buf = terminal.backend().buffer().clone();
+        let mut out = String::new();
+        for y in 0..buf.area.height {
+            for x in 0..buf.area.width {
+                out.push_str(buf[(x, y)].symbol());
+            }
+            out.push('\n');
+        }
+        out
+    }
+
+    #[test]
+    fn draft_pane_renders_field_labels_and_values() {
+        let draft = DraftPane {
+            cwd: crate::text_input::TextInput::with_value("/x"),
+            command: crate::text_input::TextInput::with_value("bash"),
+            focused_field: DraftField::Cwd,
+        };
+        let rendered = render_to_string(80, 20, |f| draft.render(f, f.area(), true));
+        for s in ["cwd", "command", "draft", "Spawn", "/x", "bash"] {
+            assert!(rendered.contains(s), "missing {s:?}:\n{rendered}");
+        }
+    }
+
+    #[test]
+    fn field_rotation_wraps_in_both_directions() {
+        let mut draft = DraftPane::default();
+        assert_eq!(draft.focused_field, DraftField::Cwd);
+        draft.next_field();
+        assert_eq!(draft.focused_field, DraftField::Command);
+        draft.next_field();
+        assert_eq!(draft.focused_field, DraftField::Submit);
+        draft.next_field();
+        assert_eq!(draft.focused_field, DraftField::Cwd);
+        draft.prev_field();
+        assert_eq!(draft.focused_field, DraftField::Submit);
+
+        draft.on_input(&InputKey::BackTab);
+        assert_eq!(draft.focused_field, DraftField::Command);
+        draft.on_input(&InputKey::Tab);
+        draft.on_input(&InputKey::Tab);
+        assert_eq!(draft.focused_field, DraftField::Cwd);
+    }
+
+    /// Editing keys must reach the focused field's text input, not a bare
+    /// String — this is what gives the operator cursor motion and word ops.
+    #[test]
+    fn editing_keys_reach_the_focused_text_input() {
+        let mut draft = DraftPane::default();
+        assert_eq!(draft.focused_field, DraftField::Cwd);
+        for k in [
+            InputKey::char('/'),
+            InputKey::char('t'),
+            InputKey::char('m'),
+            InputKey::char('p'),
+        ] {
+            draft.on_input(&k);
+        }
+        draft.on_input(&InputKey::Left);
+        draft.on_input(&InputKey::Backspace);
+        assert_eq!(draft.cwd.value(), "/tp");
+
+        // Tab to command, then a paste and ctrl-w land there, not in cwd.
+        draft.on_input(&InputKey::Tab);
+        assert_eq!(draft.focused_field, DraftField::Command);
+        draft.on_input(&InputKey::Paste("/tmp/foo".into()));
+        assert_eq!(draft.command.value(), "/tmp/foo");
+        draft.on_input(&InputKey::ctrl_char('w'));
+        assert_eq!(draft.command.value(), "");
+        assert_eq!(draft.cwd.value(), "/tp", "cwd untouched while unfocused");
+    }
+
+    /// Enter walks forward until the submit field, where it submits.
+    #[test]
+    fn enter_walks_fields_then_submits_from_submit() {
+        let mut draft = DraftPane::default();
+        assert_eq!(draft.on_input(&InputKey::Enter), DraftInputResult::Consumed);
+        assert_eq!(draft.focused_field, DraftField::Command);
+        assert_eq!(draft.on_input(&InputKey::Enter), DraftInputResult::Consumed);
+        assert_eq!(draft.focused_field, DraftField::Submit);
+        assert_eq!(draft.on_input(&InputKey::Enter), DraftInputResult::Submit);
+    }
+
+    /// The terminal cursor must sit right after the typed text in the focused
+    /// field (label is 8 chars + 1 space, block border takes column 0).
+    #[test]
+    fn render_places_the_cursor_after_the_typed_text_when_focused() {
+        let draft = DraftPane {
+            cwd: crate::text_input::TextInput::with_value("abc"),
+            ..DraftPane::default()
+        };
+        let backend = TestBackend::new(80, 20);
+        let mut terminal = Terminal::new(backend).unwrap();
+        terminal.draw(|f| draft.render(f, f.area(), true)).unwrap();
+        let pos = terminal.get_cursor_position().unwrap();
+        assert_eq!(pos, ratatui::layout::Position::new(1 + 9 + 3, 1));
+
+        // Unfocused pane: no field highlight either.
+        let rendered_unfocused = render_to_string(80, 20, |f| draft.render(f, f.area(), false));
+        let backend = TestBackend::new(80, 20);
+        let mut terminal = Terminal::new(backend).unwrap();
+        terminal.draw(|f| draft.render(f, f.area(), false)).unwrap();
+        let buf = terminal.backend().buffer();
+        assert!(
+            !buf.content()
+                .iter()
+                .any(|c| c.modifier.contains(ratatui::style::Modifier::REVERSED)),
+            "unfocused draft must not highlight fields:\n{rendered_unfocused}"
+        );
+    }
+}

crates/maestro-tui/src/lib.rs

@@ -7,6 +7,7 @@ pub mod app;
 pub mod catalog;
 pub mod cli;
 pub mod config;
+pub mod draft;
 pub mod emulators;
 pub mod input;
 pub mod keymap;

crates/maestro-tui/src/overlays.rs

@@ -1,161 +1,16 @@
-//! Overlay widgets: spawn modal, kill-confirm prompt, help overlay,
-//! transient toast.
+//! Overlay widgets: kill-confirm prompt, help overlay, transient toast.
+//!
+//! The spawn form is no longer an overlay (issue #63) — it lives in draft
+//! panes ([`crate::draft::DraftPane`]).
 //!
 //! All overlays are centered popups drawn over the rest of the UI; the
 //! `Clear` widget wipes the underlying buffer before drawing.
 
-use ratatui::layout::{Constraint, Layout, Rect};
-use ratatui::style::{Modifier, Style};
+use ratatui::layout::Rect;
 use ratatui::text::Line;
 use ratatui::widgets::{Block, Borders, Clear, List, ListItem, Paragraph};
 use ratatui::Frame;
 
-#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
-pub enum SpawnField {
-    #[default]
-    Cwd,
-    Command,
-    Submit,
-}
-
-#[derive(Debug, Default, Clone)]
-pub struct SpawnModal {
-    pub cwd: crate::text_input::TextInput,
-    pub command: crate::text_input::TextInput,
-    pub focused_field: SpawnField,
-}
-
-impl SpawnModal {
-    pub fn next_field(&mut self) {
-        self.focused_field = match self.focused_field {
-            SpawnField::Cwd => SpawnField::Command,
-            SpawnField::Command => SpawnField::Submit,
-            SpawnField::Submit => SpawnField::Cwd,
-        };
-    }
-
-    pub fn prev_field(&mut self) {
-        self.focused_field = match self.focused_field {
-            SpawnField::Cwd => SpawnField::Submit,
-            SpawnField::Command => SpawnField::Cwd,
-            SpawnField::Submit => SpawnField::Command,
-        };
-    }
-
-    /// Handle one keystroke while this modal owns input. Returns
-    /// [`SpawnInputResult::Submit`] when the user accepts; the caller fires
-    /// the POST and dismisses the modal.
-    pub fn on_input(&mut self, key: &crate::input::InputKey) -> SpawnInputResult {
-        use crate::input::InputKey;
-        match key {
-            InputKey::Tab => {
-                self.next_field();
-                SpawnInputResult::Consumed
-            }
-            InputKey::BackTab => {
-                self.prev_field();
-                SpawnInputResult::Consumed
-            }
-            InputKey::Esc => SpawnInputResult::Cancel,
-            InputKey::Enter => match self.focused_field {
-                SpawnField::Submit => SpawnInputResult::Submit,
-                _ => {
-                    self.next_field();
-                    SpawnInputResult::Consumed
-                }
-            },
-            // Everything else — characters, motion, editing, paste — goes to
-            // the focused field's text input.
-            other => {
-                match self.focused_field {
-                    SpawnField::Cwd => self.cwd.handle_key(other),
-                    SpawnField::Command => self.command.handle_key(other),
-                    SpawnField::Submit => {}
-                }
-                SpawnInputResult::Consumed
-            }
-        }
-    }
-
-    pub fn render(&self, f: &mut Frame, parent: Rect) {
-        let area = centered(parent, 60, 10);
-        f.render_widget(Clear, area);
-        let block = Block::default().title(" spawn ").borders(Borders::ALL);
-        let inner = block.inner(area);
-        f.render_widget(block, area);
-        let rows = Layout::vertical([
-            Constraint::Length(2),
-            Constraint::Length(2),
-            Constraint::Length(1),
-        ])
-        .split(inner);
-        let highlight = |field: SpawnField| {
-            if self.focused_field == field {
-                Style::default().add_modifier(Modifier::REVERSED)
-            } else {
-                Style::default()
-            }
-        };
-
-        // Each text field renders through the shared `TextInput`, which
-        // handles horizontal scrolling and reports where the terminal cursor
-        // belongs. Label is fixed-width 8 chars + 1 space = column 9.
-        let label =
-            |text: &str| Paragraph::new(Line::from(ratatui::text::Span::raw(format!("{text:8} "))));
-        f.render_widget(label("cwd:"), rows[0]);
-        f.render_widget(label("command:"), rows[1]);
-        let draw_field = |f: &mut Frame,
-                          input: &crate::text_input::TextInput,
-                          row: Rect,
-                          focused: bool|
-         -> u16 {
-            let style = if focused {
-                Style::default().add_modifier(Modifier::REVERSED)
-            } else {
-                Style::default()
-            };
-            let area = Rect {
-                x: row.x.saturating_add(9),
-                y: row.y,
-                width: row.width.saturating_sub(9),
-                height: 1,
-            };
-            input.render(area, f.buffer_mut(), style)
-        };
-        let cwd_col = draw_field(f, &self.cwd, rows[0], self.focused_field == SpawnField::Cwd);
-        let cmd_col = draw_field(
-            f,
-            &self.command,
-            rows[1],
-            self.focused_field == SpawnField::Command,
-        );
-
-        f.render_widget(
-            Paragraph::new(Line::from(vec![ratatui::text::Span::styled(
-                "[ Spawn ]",
-                highlight(SpawnField::Submit),
-            )])),
-            rows[2],
-        );
-
-        match self.focused_field {
-            SpawnField::Cwd => f.set_cursor_position((cwd_col, rows[0].y)),
-            SpawnField::Command => f.set_cursor_position((cmd_col, rows[1].y)),
-            SpawnField::Submit => {
-                // The submit button is indicated by the REVERSED style; no
-                // cursor placement.
-            }
-        }
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum SpawnInputResult {
-    Consumed,
-    Cancel,
-    Submit,
-}
-
 #[derive(Debug, Clone)]
 pub struct KillConfirm {
     pub label: String,
@@ -262,33 +117,6 @@ mod tests {
         out
     }
 
-    #[test]
-    fn spawn_modal_renders_field_labels() {
-        let modal = SpawnModal {
-            cwd: crate::text_input::TextInput::with_value("/x"),
-            command: crate::text_input::TextInput::with_value("bash"),
-            focused_field: SpawnField::Cwd,
-        };
-        let rendered = render_to_string(80, 20, |f| modal.render(f, f.area()));
-        for s in ["cwd", "command", "Spawn", "/x", "bash"] {
-            assert!(rendered.contains(s), "missing {s:?}:\n{rendered}");
-        }
-    }
-
-    #[test]
-    fn spawn_modal_field_rotation() {
-        let mut modal = SpawnModal::default();
-        assert_eq!(modal.focused_field, SpawnField::Cwd);
-        modal.next_field();
-        assert_eq!(modal.focused_field, SpawnField::Command);
-        modal.next_field();
-        assert_eq!(modal.focused_field, SpawnField::Submit);
-        modal.next_field();
-        assert_eq!(modal.focused_field, SpawnField::Cwd);
-        modal.prev_field();
-        assert_eq!(modal.focused_field, SpawnField::Submit);
-    }
-
     #[test]
     fn kill_confirm_renders_prompt() {
         let modal = KillConfirm {
@@ -306,81 +134,11 @@ mod tests {
         let help = HelpOverlay {
             lines: vec![
                 "i           EnterInsert".into(),
-                "s           OpenSpawnModal".into(),
+                "s           NewDraftPane".into(),
             ],
         };
         let rendered = render_to_string(80, 12, |f| help.render(f, f.area()));
         assert!(rendered.contains("EnterInsert"));
-        assert!(rendered.contains("OpenSpawnModal"));
-    }
-    /// Shift-Tab walked nowhere: `prev_field` existed with no caller, so the
-    /// spawn modal could only be cycled forwards.
-    #[test]
-    fn shift_tab_walks_the_spawn_modal_backwards() {
-        let mut modal = SpawnModal::default();
-        assert_eq!(modal.focused_field, SpawnField::Cwd);
-
-        modal.on_input(&crate::input::InputKey::BackTab);
-        assert_eq!(modal.focused_field, SpawnField::Submit);
-
-        modal.on_input(&crate::input::InputKey::BackTab);
-        assert_eq!(modal.focused_field, SpawnField::Command);
-    }
-
-    #[test]
-    fn tab_and_shift_tab_are_inverses() {
-        let mut modal = SpawnModal::default();
-        for _ in 0..3 {
-            modal.on_input(&crate::input::InputKey::Tab);
-            modal.on_input(&crate::input::InputKey::BackTab);
-            assert_eq!(modal.focused_field, SpawnField::Cwd);
-        }
-    }
-
-    /// Editing keys must reach the focused field's text input, not a bare
-    /// String — this is what gives the operator cursor motion and word ops.
-    #[test]
-    fn editing_keys_reach_the_focused_text_input() {
-        let mut modal = SpawnModal::default();
-        assert_eq!(modal.focused_field, SpawnField::Cwd);
-        for k in [
-            crate::input::InputKey::char('/'),
-            crate::input::InputKey::char('t'),
-            crate::input::InputKey::char('m'),
-            crate::input::InputKey::char('p'),
-        ] {
-            modal.on_input(&k);
-        }
-        modal.on_input(&crate::input::InputKey::Left);
-        modal.on_input(&crate::input::InputKey::Backspace);
-        assert_eq!(modal.cwd.value(), "/tp");
-
-        // Tab to command, then a paste and ctrl-w land there, not in cwd.
-        modal.on_input(&crate::input::InputKey::Tab);
-        assert_eq!(modal.focused_field, SpawnField::Command);
-        modal.on_input(&crate::input::InputKey::Paste("/tmp/foo".into()));
-        assert_eq!(modal.command.value(), "/tmp/foo");
-        modal.on_input(&crate::input::InputKey::ctrl_char('w'));
-        assert_eq!(modal.command.value(), "");
-        assert_eq!(modal.cwd.value(), "/tp", "cwd untouched while unfocused");
-    }
-
-    /// The terminal cursor must sit right after the typed text in the focused
-    /// field (label is 8 chars + 1 space, modal is centered on screen).
-    #[test]
-    fn render_places_the_cursor_after_the_typed_text() {
-        use ratatui::backend::TestBackend;
-        use ratatui::Terminal;
-
-        let modal = SpawnModal {
-            cwd: crate::text_input::TextInput::with_value("abc"),
-            ..SpawnModal::default()
-        };
-        let backend = TestBackend::new(80, 20);
-        let mut terminal = Terminal::new(backend).unwrap();
-        terminal.draw(|f| modal.render(f, f.area())).unwrap();
-        // Modal: x = (80-60)/2 = 10; block border → inner.x = 11; label col 9.
-        let pos = terminal.get_cursor_position().unwrap();
-        assert_eq!(pos, ratatui::layout::Position::new(11 + 9 + 3, 6));
+        assert!(rendered.contains("NewDraftPane"));
     }
 }

crates/maestro-tui/src/render.rs

@@ -10,7 +10,7 @@ use ratatui::Frame;
 
 use crate::input::Region;
 use crate::keymap::Mode;
-use crate::overlays::{HelpOverlay, KillConfirm, SpawnModal, Toast};
+use crate::overlays::{HelpOverlay, KillConfirm, Toast};
 use crate::pane::Pane;
 use crate::sidebar::Sidebar;
 use crate::state::{AppState, Focus, OverlayKind};
@@ -63,8 +63,9 @@ pub struct RenderInputs<'a> {
     pub sidebar: &'a Sidebar,
     pub tab_bar: &'a TabBar,
     pub pane: Option<&'a Pane>,
+    /// Inline spawn form when the active tab's pane is a draft (issue #63).
+    pub draft: Option<&'a crate::draft::DraftPane>,
     pub state: &'a AppState,
-    pub spawn: &'a SpawnModal,
     pub help: &'a HelpOverlay,
 }
 
@@ -131,6 +132,9 @@ pub fn draw(f: &mut Frame, inputs: RenderInputs<'_>) -> RegionMap {
     if let Some(p) = inputs.pane {
         p.render(f, pane_area);
     }
+    if let Some(d) = inputs.draft {
+        d.render(f, pane_area, pane_focused);
+    }
     map.pane = Some(pane_area);
 
     // Status bar — always visible, never eclipsed by overlays so the user can
@@ -138,10 +142,6 @@ pub fn draw(f: &mut Frame, inputs: RenderInputs<'_>) -> RegionMap {
     render_status_bar(f, status_area, inputs.state);
 
     match inputs.state.overlay() {
-        Some(OverlayKind::Spawn) => {
-            inputs.spawn.render(f, area);
-            map.modal = Some(area);
-        }
         Some(OverlayKind::KillConfirm(id)) => {
             let kc = KillConfirm {
                 label: id.to_string(),
@@ -186,7 +186,7 @@ fn render_status_bar(f: &mut Frame, area: Rect, state: &AppState) {
         Focus::Pane => "pane",
     };
     let hint = match state.mode {
-        Mode::Normal => "j/k: nav  •  enter: attach  •  s: spawn  •  ?: help  •  ^Wq: quit",
+        Mode::Normal => "j/k: nav  •  enter: attach  •  s: new draft  •  ?: help  •  ^Wq: quit",
         Mode::Insert => "^a: back to normal",
     };
     let mode_style = match state.mode {
@@ -266,4 +266,57 @@ mod tests {
         assert_eq!(map.region_at(15, 10), Region::Modal);
         assert_eq!(map.region_at(3, 12), Region::SidebarRow); // outside modal
     }
+
+    /// Issue #63: an empty pane is a draft — the frame must show the spawn
+    /// form where the terminal would otherwise be.
+    #[test]
+    fn a_draft_pane_renders_the_spawn_form_in_its_pane_area() {
+        use crate::overlays::HelpOverlay;
+        use crate::state::PaneRef;
+        use std::collections::HashSet;
+
+        let mut state = AppState::new();
+        state.open_draft_pane();
+        let draft = match &state.tabs[0].pane {
+            Some(PaneRef::Draft(d)) => d,
+            other => panic!("expected a draft pane, got {other:?}"),
+        };
+        let sidebar = Sidebar {
+            sessions: Vec::new(),
+            highlight: None,
+            attached: HashSet::new(),
+        };
+        let tab_bar = TabBar {
+            tab_names: vec!["1".into()],
+            active_idx: 0,
+        };
+        let help = HelpOverlay { lines: Vec::new() };
+        let inputs = RenderInputs {
+            sidebar: &sidebar,
+            tab_bar: &tab_bar,
+            pane: None,
+            draft: Some(draft),
+            state: &state,
+            help: &help,
+        };
+
+        let backend = ratatui::backend::TestBackend::new(80, 24);
+        let mut terminal = ratatui::Terminal::new(backend).unwrap();
+        terminal
+            .draw(|f| {
+                draw(f, inputs);
+            })
+            .unwrap();
+        let buf = terminal.backend().buffer().clone();
+        let mut out = String::new();
+        for y in 0..buf.area.height {
+            for x in 0..buf.area.width {
+                out.push_str(buf[(x, y)].symbol());
+            }
+            out.push('\n');
+        }
+        for s in ["draft", "cwd:", "command:", "[ Spawn ]"] {
+            assert!(out.contains(s), "missing {s:?}:\n{out}");
+        }
+    }
 }

crates/maestro-tui/src/state.rs

@@ -1,14 +1,16 @@
 //! `AppState` — the top-level mutable state of the running TUI.
 //!
 //! v1 keeps it small on purpose: a list of tabs (each bound to at most one
-//! session), an active tab index, focus split between sidebar and pane, the
-//! current input mode, and an optional overlay (spawn modal, kill confirm,
-//! help, transient toast).
+//! session or a draft form), an active tab index, focus split between sidebar
+//! and pane, the current input mode, and an optional overlay (kill confirm,
+//! help, transient toast). The spawn form is no longer an overlay — an empty
+//! pane is a draft pane (issue #63).
 //!
-//! v1.5 will replace `Tab::pane: Option<SessionId>` with a split tree.
+//! v1.5 will replace `Tab::pane`'s single slot with a split tree.
 
 use uuid::Uuid;
 
+use crate::draft::DraftPane;
 use crate::keymap::Mode;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -17,15 +19,31 @@ pub enum Focus {
     Pane,
 }
 
+/// What a tab's pane slot holds: a live session, or an inline draft form.
+#[derive(Debug, Clone, PartialEq)]
+pub enum PaneRef {
+    Session(Uuid),
+    Draft(DraftPane),
+}
+
 #[derive(Debug, Clone)]
 pub struct Tab {
     pub name: String,
-    pub pane: Option<Uuid>,
+    pub pane: Option<PaneRef>,
+}
+
+impl Tab {
+    /// The session this tab shows, if it shows one. Draft panes have none.
+    pub fn session(&self) -> Option<Uuid> {
+        match &self.pane {
+            Some(PaneRef::Session(sid)) => Some(*sid),
+            _ => None,
+        }
+    }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum OverlayKind {
-    Spawn,
     KillConfirm(Uuid),
     Help,
     Toast(String),
@@ -108,7 +126,8 @@ impl AppState {
     ///
     /// Returns the session that tab was showing, if any, so the caller can
     /// release its emulator. Without that the tab's WebSocket task and vt100
-    /// parser outlive the tab forever.
+    /// parser outlive the tab forever. A draft pane holds no session and
+    /// releases nothing.
     pub fn close_tab(&mut self) -> Option<Uuid> {
         if self.tabs.len() <= 1 {
             return None;
@@ -117,9 +136,10 @@ impl AppState {
         if self.active_tab_idx >= self.tabs.len() {
             self.active_tab_idx = self.tabs.len() - 1;
         }
+        let sid = closed.session()?;
         // Only release it if no other tab still shows the same session.
-        let still_shown = self.tabs.iter().any(|t| t.pane == closed.pane);
-        closed.pane.filter(|_| !still_shown)
+        let still_shown = self.tabs.iter().any(|t| t.session() == Some(sid));
+        (!still_shown).then_some(sid)
     }
 
     pub fn next_tab(&mut self) {
@@ -147,11 +167,37 @@ impl AppState {
     /// drop straight into Insert mode so keystrokes go to the session
     /// without an extra `i` press. The leader returns to Normal.
     pub fn attach_to_focused(&mut self, session_id: Uuid) {
-        self.active_tab_mut().pane = Some(session_id);
+        self.active_tab_mut().pane = Some(PaneRef::Session(session_id));
         self.focus = Focus::Pane;
         self.mode = Mode::Insert;
     }
 
+    /// Open a draft form in a pane (issue #63): reuse the empty active pane,
+    /// otherwise open a fresh tab for it — v1 has no split tree, so "split"
+    /// means a new tab. Focus lands in the pane, Insert mode on, so typing
+    /// starts immediately, same flow as [`Self::attach_to_focused`].
+    pub fn open_draft_pane(&mut self) {
+        if self.active_tab().pane.is_some() {
+            self.new_tab();
+        }
+        self.active_tab_mut().pane = Some(PaneRef::Draft(DraftPane::default()));
+        self.focus = Focus::Pane;
+        self.mode = Mode::Insert;
+    }
+
+    /// A draft submit succeeded: replace whatever the active tab showed with
+    /// the new session in place, matching the web client's behaviour (#57).
+    pub fn complete_spawn(&mut self, sid: Uuid) {
+        self.active_tab_mut().pane = Some(PaneRef::Session(sid));
+        self.focus = Focus::Pane;
+        self.mode = Mode::Insert;
+    }
+
+    /// The session shown by the active tab's pane, if any.
+    pub fn active_session(&self) -> Option<Uuid> {
+        self.active_tab().session()
+    }
+
     /// Move the sidebar highlight by `delta` (positive = down) within the
     /// given ordered list of selectable session ids. Wraps. No-op on empty.
     pub fn move_sidebar_highlight(&mut self, order: &[Uuid], delta: i32) {
@@ -288,7 +334,7 @@ mod tests {
         let mut state = AppState::new();
         let sid = Uuid::from_u128(7);
         state.attach_to_focused(sid);
-        assert_eq!(state.tabs[0].pane, Some(sid));
+        assert_eq!(state.tabs[0].session(), Some(sid));
         assert_eq!(state.focus, Focus::Pane);
         // The user expects to type into the session right away; the leader
         // (default ctrl-a) is the way back.
@@ -314,7 +360,7 @@ mod tests {
         let mut state = AppState::new();
         let sid = Uuid::from_u128(3);
         state.new_tab();
-        state.active_tab_mut().pane = Some(sid);
+        state.active_tab_mut().pane = Some(PaneRef::Session(sid));
 
         assert_eq!(state.close_tab(), Some(sid));
     }
@@ -324,9 +370,9 @@ mod tests {
     fn close_tab_keeps_a_session_another_tab_still_shows() {
         let mut state = AppState::new();
         let sid = Uuid::from_u128(4);
-        state.active_tab_mut().pane = Some(sid);
+        state.active_tab_mut().pane = Some(PaneRef::Session(sid));
         state.new_tab();
-        state.active_tab_mut().pane = Some(sid);
+        state.active_tab_mut().pane = Some(PaneRef::Session(sid));
 
         assert_eq!(state.close_tab(), None);
     }
@@ -334,7 +380,7 @@ mod tests {
     #[test]
     fn close_tab_is_a_no_op_on_the_last_tab() {
         let mut state = AppState::new();
-        state.active_tab_mut().pane = Some(Uuid::from_u128(5));
+        state.active_tab_mut().pane = Some(PaneRef::Session(Uuid::from_u128(5)));
         assert_eq!(state.close_tab(), None);
         assert_eq!(state.tabs.len(), 1);
     }
@@ -347,4 +393,52 @@ mod tests {
         assert!(state.dismiss_overlay());
         assert!(state.overlay().is_none());
     }
+
+    /// Issue #63: `s` over an empty pane turns that pane into a draft —
+    /// focused, Insert mode on, typing starts immediately.
+    #[test]
+    fn open_draft_reuses_the_empty_active_pane() {
+        let mut state = AppState::new();
+        state.open_draft_pane();
+        assert!(matches!(state.active_tab().pane, Some(PaneRef::Draft(_))));
+        assert_eq!(state.focus, Focus::Pane);
+        assert_eq!(state.mode, Mode::Insert);
+        assert_eq!(state.tabs.len(), 1);
+    }
+
+    /// A tab already showing a session gets a fresh tab for the draft; v1
+    /// has no split tree, so a new tab is the "split".
+    #[test]
+    fn open_draft_over_a_session_opens_a_new_tab() {
+        let mut state = AppState::new();
+        state.attach_to_focused(Uuid::from_u128(9));
+        state.open_draft_pane();
+        assert_eq!(state.tabs.len(), 2);
+        assert_eq!(state.active_tab_idx, 1);
+        assert!(matches!(state.active_tab().pane, Some(PaneRef::Draft(_))));
+        // The session tab is untouched.
+        assert_eq!(state.tabs[0].session(), Some(Uuid::from_u128(9)));
+    }
+
+    /// Web parity (#57): submitting fills the pane in place.
+    #[test]
+    fn complete_spawn_replaces_the_draft_with_the_session() {
+        let mut state = AppState::new();
+        state.open_draft_pane();
+        let sid = Uuid::from_u128(21);
+        state.complete_spawn(sid);
+        assert_eq!(state.active_tab().session(), Some(sid));
+        assert_eq!(state.focus, Focus::Pane);
+        assert_eq!(state.mode, Mode::Insert);
+    }
+
+    /// A closed draft tab holds no session, so nothing is released.
+    #[test]
+    fn close_tab_reports_nothing_for_a_draft_pane() {
+        let mut state = AppState::new();
+        state.open_draft_pane();
+        state.new_tab();
+        state.active_tab_idx = 0;
+        assert_eq!(state.close_tab(), None);
+    }
 }

crates/maestro-tui/src/text_input.rs

@@ -14,7 +14,7 @@ use ratatui::style::Style;
 
 use crate::input::InputKey;
 
-#[derive(Debug, Default, Clone)]
+#[derive(Debug, Default, Clone, PartialEq, Eq)]
 pub struct TextInput {
     value: String,
     /// Cursor position as a char offset into `value`.