fix(maestro): match the web form's distinct branch-field labels in the TUI (#94)

The draft pane's new-branch gutter was labelled "br:" in both branch
modes — since #94's web fix now says "New branch name" / "Pick a
branch", mirror the same distinction here: "new:" for the branch-name
input, "pick:" for the existing-branch list (which previously had no
label at all).

crates/maestro-tui/src/draft.rs

@@ -1392,7 +1392,7 @@ impl DraftPane {
             match self.branch_mode {
                 WorktreeBranchMode::New => {
                     let row = next_row();
-                    draw_gutter(f, row, "br:");
+                    draw_gutter(f, row, "new:");
                     let col =
                         draw_text_field(f, &self.branch, row, field_style(DraftField::BranchNew));
                     if self.focused_field == DraftField::BranchNew {
@@ -1416,6 +1416,7 @@ impl DraftPane {
                         .unwrap_or(0)
                         .min(20);
                     let list_row = next_row();
+                    draw_gutter(f, list_row, "pick:");
                     for i in start..(start + capacity).min(len.max(1)) {
                         let y = list_row.y + (i - start) as u16;
                         if y >= list_row.y + list_row.height {
@@ -2541,10 +2542,25 @@ mod tests {
         draft.base_repo = Some(PathBuf::from("/home/u/tea/maestro"));
         draft.probed_cwd = Some(PathBuf::from("/home/u/tea/maestro"));
         let rendered = render_to_string(100, 24, |f| draft.render(f, f.area(), true));
-        for s in ["[new] [existing]", "br:", "crimson-otter"] {
+        for s in ["[new] [existing]", "new:", "crimson-otter"] {
             assert!(rendered.contains(s), "missing {s:?}:\n{rendered}");
         }
 
+        // The new-branch input and existing-branch picker must not share a
+        // label — matching the web form's "New branch name" / "Pick a
+        // branch" (#94).
+        draft.set_branch_mode(WorktreeBranchMode::Existing);
+        let rendered = render_to_string(100, 24, |f| draft.render(f, f.area(), true));
+        assert!(
+            rendered.contains("pick:"),
+            "missing pick: label:\n{rendered}"
+        );
+        assert!(
+            !rendered.contains("br:"),
+            "stale ambiguous label:\n{rendered}"
+        );
+        draft.set_branch_mode(WorktreeBranchMode::New);
+
         draft.focused_field = DraftField::WorktreeToggle;
         draft.on_input(&InputKey::Enter);
         let rendered = render_to_string(100, 24, |f| draft.render(f, f.area(), true));