feat(maestro): add Android command bar (#270)

Bottom-sheet ctrl-k-style search over sessions, a `>` command
registry and `~` directories (docs/COMMAND-BAR.md), with a
long-press action menu for rename/kill/spawn-similar. v1 uses a
simple weighted substring/fuzzy matcher rather than the scored
matcher web/#146 and the TUI/#147 share. Wires an FAB and a
best-effort hardware Ctrl-K into MaestroApp.

android/app/src/main/java/pt/naps/maestro/ui/MaestroApp.kt

@@ -6,6 +6,7 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
@@ -13,6 +14,7 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material3.DrawerValue
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.ModalDrawerSheet
 import androidx.compose.material3.ModalNavigationDrawer
@@ -26,9 +28,21 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.focusTarget
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEventType
+import androidx.compose.ui.input.key.isCtrlPressed
+import androidx.compose.ui.input.key.key
+import androidx.compose.ui.input.key.onPreviewKeyEvent
+import androidx.compose.ui.input.key.type
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavType
 import androidx.navigation.compose.NavHost
@@ -42,6 +56,8 @@ import pt.naps.maestro.connection.DaemonPrefs
 import pt.naps.maestro.connection.LinkState
 import pt.naps.maestro.data.Session
 import pt.naps.maestro.data.SessionView
+import pt.naps.maestro.ui.commandbar.CommandBarSheet
+import pt.naps.maestro.ui.commandbar.CommandBarViewModel
 import pt.naps.maestro.ui.sidebar.SidebarContent
 import pt.naps.maestro.ui.sidebar.sessionName
 import pt.naps.maestro.ui.spawn.SpawnSheet
@@ -60,6 +76,13 @@ private object Routes {
     fun structured(id: String) = "structured/$id"
 }
 
+/** What to pre-fill the spawn form with when it was opened from the command
+ * bar (#270) rather than from a blank "Spawn session" tap. */
+private sealed interface SpawnSeed {
+    data class Similar(val session: Session) : SpawnSeed
+    data class Directory(val path: String) : SpawnSeed
+}
+
 /**
  * Top-level app structure (#268): a persistent [ModalNavigationDrawer] around
  * a single-back-stack [NavHost], tying together the sidebar (#264/#265), the
@@ -77,6 +100,8 @@ fun MaestroApp(daemonLink: DaemonLink, prefs: DaemonPrefs) {
     val linkState by daemonLink.state.collectAsState()
     val baseUrl by prefs.baseUrl.collectAsState()
     var showSpawnSheet by remember { mutableStateOf(false) }
+    var spawnSeed by remember { mutableStateOf<SpawnSeed?>(null) }
+    var showCommandBar by remember { mutableStateOf(false) }
 
     val infoClient = remember(baseUrl) { MaestroClient(baseUrl) }
     var hostname by remember(baseUrl) { mutableStateOf("") }
@@ -99,66 +124,144 @@ fun MaestroApp(daemonLink: DaemonLink, prefs: DaemonPrefs) {
         scope.launch { drawerState.close() }
     }
 
-    ModalNavigationDrawer(
-        drawerState = drawerState,
-        drawerContent = {
-            ModalDrawerSheet(modifier = Modifier.width(320.dp)) {
-                SidebarContent(
-                    catalogStore = daemonLink.catalog,
-                    onOpenSession = ::openSession,
-                )
-            }
-        },
+    fun spawnNew() {
+        spawnSeed = null
+        showSpawnSheet = true
+    }
+
+    fun spawnInDirectory(path: String) {
+        spawnSeed = SpawnSeed.Directory(path)
+        showSpawnSheet = true
+    }
+
+    fun spawnSimilar(session: Session) {
+        spawnSeed = SpawnSeed.Similar(session)
+        showSpawnSheet = true
+    }
+
+    // Ctrl-K opens the bar from anywhere (docs/COMMAND-BAR.md); a focusable
+    // root keeps the shortcut live except while something else (the bar's own
+    // search field, a text input) holds focus instead.
+    val rootFocusRequester = remember { FocusRequester() }
+    LaunchedEffect(showCommandBar) {
+        if (!showCommandBar) rootFocusRequester.requestFocus()
+    }
+
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .focusRequester(rootFocusRequester)
+            .focusTarget()
+            .onPreviewKeyEvent { event ->
+                if (event.type == KeyEventType.KeyDown && event.isCtrlPressed && event.key == Key.K) {
+                    showCommandBar = true
+                    true
+                } else {
+                    false
+                }
+            },
     ) {
-        Column(modifier = Modifier.fillMaxWidth()) {
-            ConnectionStatusBar(linkState = linkState, hostname = hostname)
-            NavHost(navController = navController, startDestination = Routes.WELCOME) {
-                composable(Routes.WELCOME) {
-                    WelcomeScreen(
-                        onOpenSessions = { scope.launch { drawerState.open() } },
-                        onSpawnSession = { showSpawnSheet = true },
+        ModalNavigationDrawer(
+            drawerState = drawerState,
+            drawerContent = {
+                ModalDrawerSheet(modifier = Modifier.width(320.dp)) {
+                    SidebarContent(
+                        catalogStore = daemonLink.catalog,
+                        onOpenSession = ::openSession,
                     )
                 }
-                composable(
-                    Routes.TERMINAL,
-                    arguments = listOf(navArgument("sessionId") { type = NavType.StringType }),
-                ) { backStackEntry ->
-                    val id = backStackEntry.arguments?.getString("sessionId") ?: return@composable
-                    TerminalScreen(
-                        daemonBaseUrl = baseUrl,
-                        sessionId = id,
-                        sessionTitle = sessions[id]?.let(::sessionName) ?: id,
-                        onBack = { navController.popBackStack(Routes.WELCOME, inclusive = false) },
-                    )
-                }
-                composable(
-                    Routes.STRUCTURED,
-                    arguments = listOf(navArgument("sessionId") { type = NavType.StringType }),
-                ) { backStackEntry ->
-                    val id = backStackEntry.arguments?.getString("sessionId") ?: return@composable
-                    StructuredScreen(
-                        daemonBaseUrl = baseUrl,
-                        sessionId = id,
-                        sessionTitle = sessions[id]?.let(::sessionName) ?: id,
-                        onBack = { navController.popBackStack(Routes.WELCOME, inclusive = false) },
-                    )
+            },
+        ) {
+            Column(modifier = Modifier.fillMaxWidth()) {
+                ConnectionStatusBar(linkState = linkState, hostname = hostname)
+                NavHost(navController = navController, startDestination = Routes.WELCOME) {
+                    composable(Routes.WELCOME) {
+                        WelcomeScreen(
+                            onOpenSessions = { scope.launch { drawerState.open() } },
+                            onSpawnSession = { spawnNew() },
+                        )
+                    }
+                    composable(
+                        Routes.TERMINAL,
+                        arguments = listOf(navArgument("sessionId") { type = NavType.StringType }),
+                    ) { backStackEntry ->
+                        val id = backStackEntry.arguments?.getString("sessionId") ?: return@composable
+                        TerminalScreen(
+                            daemonBaseUrl = baseUrl,
+                            sessionId = id,
+                            sessionTitle = sessions[id]?.let(::sessionName) ?: id,
+                            onBack = { navController.popBackStack(Routes.WELCOME, inclusive = false) },
+                        )
+                    }
+                    composable(
+                        Routes.STRUCTURED,
+                        arguments = listOf(navArgument("sessionId") { type = NavType.StringType }),
+                    ) { backStackEntry ->
+                        val id = backStackEntry.arguments?.getString("sessionId") ?: return@composable
+                        StructuredScreen(
+                            daemonBaseUrl = baseUrl,
+                            sessionId = id,
+                            sessionTitle = sessions[id]?.let(::sessionName) ?: id,
+                            onBack = { navController.popBackStack(Routes.WELCOME, inclusive = false) },
+                        )
+                    }
                 }
             }
         }
+
+        FloatingActionButton(
+            onClick = { showCommandBar = true },
+            modifier = Modifier
+                .align(Alignment.BottomEnd)
+                .padding(16.dp)
+                .semantics { contentDescription = "Search sessions and commands" },
+        ) {
+            Text("⌕")
+        }
     }
 
     if (showSpawnSheet) {
-        val viewModel = remember(infoClient) { SpawnViewModel(infoClient) }
+        val seed = spawnSeed
+        val viewModel = remember(infoClient, seed) {
+            SpawnViewModel(infoClient).also {
+                when (seed) {
+                    is SpawnSeed.Similar -> {
+                        it.setCwd(seed.session.cwd)
+                        it.setCustomCommand(seed.session.command)
+                    }
+                    is SpawnSeed.Directory -> it.setCwd(seed.path)
+                    null -> {}
+                }
+            }
+        }
         SpawnSheet(
             viewModel = viewModel,
-            onDismiss = { showSpawnSheet = false },
+            onDismiss = {
+                showSpawnSheet = false
+                spawnSeed = null
+            },
             onSpawned = { session ->
                 showSpawnSheet = false
+                spawnSeed = null
                 openSession(session)
             },
         )
     }
 
+    if (showCommandBar) {
+        val commandBarViewModel = remember(daemonLink, infoClient) {
+            CommandBarViewModel(daemonLink.catalog, infoClient)
+        }
+        CommandBarSheet(
+            viewModel = commandBarViewModel,
+            onDismiss = { showCommandBar = false },
+            onOpenSession = ::openSession,
+            onSpawnNew = ::spawnNew,
+            onSpawnDirectory = ::spawnInDirectory,
+            onSpawnSimilar = ::spawnSimilar,
+        )
+    }
+
     // Declared last so it sits above the NavHost's own back handling on the
     // dispatcher stack: a drawer open over a session must close first, not
     // pop the session back to Welcome.

android/app/src/main/java/pt/naps/maestro/ui/commandbar/CommandBarModel.kt

@@ -0,0 +1,190 @@
+package pt.naps.maestro.ui.commandbar
+
+import java.time.Instant
+import pt.naps.maestro.data.Session
+import pt.naps.maestro.data.SessionStatus
+import pt.naps.maestro.ui.sidebar.programName
+import pt.naps.maestro.ui.sidebar.sessionName
+
+/** The command bar's pure model (docs/COMMAND-BAR.md): candidates, the sigil
+ * grammar, and the ranking. Android's v1 matcher is deliberately a simple
+ * weighted substring/fuzzy scorer, not the scored dynamic-program matcher
+ * `web`/#146 and the TUI/#147 share — see the issue for why a lighter
+ * matcher was chosen for the first cut. */
+sealed interface BarCandidate {
+    data class SessionItem(val session: Session) : BarCandidate
+    data class CommandItem(val command: BarCommand) : BarCandidate
+    data class DirectoryItem(val path: String, val display: String) : BarCandidate
+}
+
+data class BarCommand(val id: String, val label: String)
+
+/** The bar's fixed `>` registry for v1: the app has no keymap/command palette
+ * of its own yet, so spawning is the one action worth reaching from anywhere. */
+val BAR_COMMANDS: List<BarCommand> = listOf(BarCommand(id = "spawn", label = "Spawn session"))
+
+sealed interface BarSigil {
+    object Commands : BarSigil
+    object Directories : BarSigil
+}
+
+data class ParsedBarQuery(val sigil: BarSigil?, val query: String)
+
+/** A sigil is only a sigil in first position (docs/COMMAND-BAR.md) — typed
+ * anywhere else, or backspaced away, it is an ordinary query character. */
+fun parseBarQuery(raw: String): ParsedBarQuery = when (raw.firstOrNull()) {
+    '>' -> ParsedBarQuery(BarSigil.Commands, raw.substring(1))
+    '~' -> ParsedBarQuery(BarSigil.Directories, raw.substring(1))
+    else -> ParsedBarQuery(null, raw)
+}
+
+private fun instantMs(iso: String?): Long? {
+    if (iso.isNullOrEmpty()) return null
+    return runCatching { Instant.parse(iso).toEpochMilli() }.getOrNull()
+}
+
+/** Empty-query session order (docs/COMMAND-BAR.md, "Empty query"): most
+ * recently focused first; a session never focused sorts after every session
+ * that has been, most recently created first among those; a dead session
+ * sorts last regardless of recency. */
+fun orderSessionsForBar(sessions: List<Session>): List<Session> = sessions.sortedWith(
+    Comparator { a, b ->
+        val deadA = if (a.status == SessionStatus.Dead) 1 else 0
+        val deadB = if (b.status == SessionStatus.Dead) 1 else 0
+        if (deadA != deadB) return@Comparator deadA - deadB
+
+        val focusA = instantMs(a.last_focused_at)
+        val focusB = instantMs(b.last_focused_at)
+        if ((focusA == null) != (focusB == null)) return@Comparator if (focusA == null) 1 else -1
+        if (focusA != null && focusB != null && focusA != focusB) return@Comparator focusB.compareTo(focusA)
+
+        (instantMs(b.created_at) ?: 0L).compareTo(instantMs(a.created_at) ?: 0L)
+    },
+)
+
+/** `~/dev/api`, not `/home/me/dev/api` — the abbreviation the sidebar and the
+ * spawn form both use. */
+fun abbreviateCwd(path: String, homeDir: String): String = when {
+    homeDir.isEmpty() -> path
+    path == homeDir -> "~"
+    path.startsWith("$homeDir/") -> "~" + path.removePrefix(homeDir)
+    else -> path
+}
+
+/** The inverse of [abbreviateCwd], for a path the operator typed. */
+fun expandHome(path: String, homeDir: String): String = when {
+    homeDir.isEmpty() -> path
+    path == "~" -> homeDir
+    path.startsWith("~/") -> homeDir + path.removePrefix("~")
+    else -> path
+}
+
+/** `~`'s candidates, deduped by the directory they spawn in and keeping the
+ * first mention of each. */
+fun directoryCandidates(paths: List<String>, homeDir: String): List<BarCandidate.DirectoryItem> {
+    val seen = LinkedHashSet<String>()
+    val out = mutableListOf<BarCandidate.DirectoryItem>()
+    for (path in paths) {
+        if (path.isEmpty() || !seen.add(path)) continue
+        out += BarCandidate.DirectoryItem(path = path, display = abbreviateCwd(path, homeDir))
+    }
+    return out
+}
+
+private data class BarField(val name: String, val text: String, val weight: Int)
+
+/** Field weights, ported from docs/COMMAND-BAR.md's candidate table — kept so
+ * an exact `tool` match can still outrank a weaker `name` match, even though
+ * the per-character scoring underneath is simplified. */
+private fun fieldsFor(candidate: BarCandidate, homeDir: String): List<BarField> = when (candidate) {
+    is BarCandidate.SessionItem -> {
+        val session = candidate.session
+        val directory = session.worktree?.base_repo ?: session.cwd
+        listOfNotNull(
+            BarField("name", sessionName(session), 0),
+            BarField("directory", abbreviateCwd(directory, homeDir), -24),
+            session.command.takeIf { it.isNotEmpty() }?.let { BarField("command", it, -32) },
+            BarField("tool", programName(session.command), -40),
+        )
+    }
+    is BarCandidate.CommandItem -> listOf(BarField("label", candidate.command.label, 0))
+    is BarCandidate.DirectoryItem -> listOf(BarField("path", candidate.display, 0))
+}
+
+private const val MATCH_EXACT = 100
+private const val MATCH_PREFIX = 70
+private const val MATCH_CONTAINS = 50
+private const val MATCH_FUZZY = 20
+
+/** Case-insensitive subsequence: every character of [query] appears in [text]
+ * in order, not necessarily adjacent. */
+private fun isSubsequence(query: String, text: String): Boolean {
+    var i = 0
+    for (c in text) {
+        if (i >= query.length) break
+        if (c == query[i]) i++
+    }
+    return i == query.length
+}
+
+private fun fieldMatchScore(query: String, text: String): Int? {
+    val q = query.lowercase()
+    val t = text.lowercase()
+    return when {
+        t == q -> MATCH_EXACT
+        t.startsWith(q) -> MATCH_PREFIX
+        t.contains(q) -> MATCH_CONTAINS
+        isSubsequence(q, t) -> MATCH_FUZZY
+        else -> null
+    }
+}
+
+private fun kindOrder(candidate: BarCandidate): Int = when (candidate) {
+    is BarCandidate.SessionItem -> 0
+    is BarCandidate.CommandItem -> 1
+    is BarCandidate.DirectoryItem -> 2
+}
+
+data class BarResult(val candidate: BarCandidate, val score: Int, val matchedField: String?)
+
+/** Ranks [candidates] against [query]. An empty query matches everything at
+ * score 0 in input order (docs/COMMAND-BAR.md, "Empty query"); the bar's own
+ * rules decide what is in the candidate list at that point. */
+fun rankCandidates(query: String, candidates: List<BarCandidate>, homeDir: String): List<BarResult> {
+    val trimmed = query.trim()
+    if (trimmed.isEmpty()) return candidates.map { BarResult(it, 0, null) }
+
+    val results = candidates.mapNotNull { candidate ->
+        var best: BarResult? = null
+        for (field in fieldsFor(candidate, homeDir)) {
+            val matchScore = fieldMatchScore(trimmed, field.text) ?: continue
+            val total = matchScore + field.weight
+            if (best == null || total > best.score) best = BarResult(candidate, total, field.name)
+        }
+        best
+    }
+    // Stable sort: ties keep the caller's order (sessions most-recently-focused
+    // first, commands in registry order), matching the shared matcher's last
+    // tie-break without reproducing its length/codepoint rules.
+    return results.sortedWith(compareByDescending<BarResult> { it.score }.thenBy { kindOrder(it.candidate) })
+}
+
+data class BarGroup(val title: String, val results: List<BarResult>)
+
+private fun titleFor(candidate: BarCandidate): String = when (candidate) {
+    is BarCandidate.SessionItem -> "Sessions"
+    is BarCandidate.CommandItem -> "Commands"
+    is BarCandidate.DirectoryItem -> "Directories"
+}
+
+/** Buckets a ranked list by kind for rendering. Grouping is a rendering of the
+ * ranking, never a reordering of it: groups appear in the order their
+ * best-scoring member does, because [results] is already rank-ordered and a
+ * `LinkedHashMap` keeps first-seen order. */
+fun groupResults(results: List<BarResult>): List<BarGroup> {
+    val groups = LinkedHashMap<String, MutableList<BarResult>>()
+    for (result in results) {
+        groups.getOrPut(titleFor(result.candidate)) { mutableListOf() }.add(result)
+    }
+    return groups.map { (title, group) -> BarGroup(title, group) }
+}

android/app/src/main/java/pt/naps/maestro/ui/commandbar/CommandBarSheet.kt

@@ -0,0 +1,307 @@
+package pt.naps.maestro.ui.commandbar
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.background
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.SheetState
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.rememberModalBottomSheetState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import pt.naps.maestro.data.Session
+import pt.naps.maestro.ui.sidebar.ActivityRail
+import pt.naps.maestro.ui.sidebar.MetaLine
+import pt.naps.maestro.ui.sidebar.customSessionName
+import pt.naps.maestro.ui.sidebar.formatInTheWay
+import pt.naps.maestro.ui.sidebar.rememberTickingNowMs
+import pt.naps.maestro.ui.sidebar.sessionBlockers
+import pt.naps.maestro.ui.sidebar.sessionName
+
+/** #270's `ctrl-k` command bar (docs/COMMAND-BAR.md): a search field over a
+ * bottom sheet, sessions and the `>` registry mixed by default, `>` and `~`
+ * narrowing to one kind. Tap opens a result; long-press on a session opens
+ * its action menu (rename, kill, spawn similar) — the bar picks the action
+ * and hands off to the flow that already implements it, it never
+ * reimplements one. */
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
+@Composable
+fun CommandBarSheet(
+    viewModel: CommandBarViewModel,
+    onDismiss: () -> Unit,
+    onOpenSession: (Session) -> Unit,
+    onSpawnNew: () -> Unit,
+    onSpawnDirectory: (String) -> Unit,
+    onSpawnSimilar: (Session) -> Unit,
+    modifier: Modifier = Modifier,
+    sheetState: SheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true),
+) {
+    val state by viewModel.state.collectAsState()
+    val nowMs = rememberTickingNowMs()
+    val focusRequester = remember { FocusRequester() }
+
+    var actionSession by remember { mutableStateOf<Session?>(null) }
+    var renaming by remember { mutableStateOf<Session?>(null) }
+    var confirmingKill by remember { mutableStateOf<Session?>(null) }
+
+    fun activate(candidate: BarCandidate) {
+        when (candidate) {
+            is BarCandidate.SessionItem -> onOpenSession(candidate.session)
+            is BarCandidate.CommandItem -> onSpawnNew()
+            is BarCandidate.DirectoryItem -> onSpawnDirectory(candidate.path)
+        }
+        onDismiss()
+    }
+
+    ModalBottomSheet(onDismissRequest = onDismiss, sheetState = sheetState, modifier = modifier) {
+        Column(Modifier.fillMaxWidth().heightIn(max = 560.dp)) {
+            OutlinedTextField(
+                value = state.query,
+                onValueChange = viewModel::onQueryChange,
+                placeholder = { Text(placeholderFor(state.sigil)) },
+                singleLine = true,
+                keyboardOptions = KeyboardOptions(imeAction = ImeAction.Search),
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 16.dp, vertical = 8.dp)
+                    .focusRequester(focusRequester),
+            )
+            LaunchedEffect(Unit) { focusRequester.requestFocus() }
+
+            if (state.groups.isEmpty()) {
+                Box(Modifier.fillMaxWidth().padding(24.dp), contentAlignment = Alignment.Center) {
+                    Text(
+                        "No matches",
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        style = MaterialTheme.typography.bodyMedium,
+                    )
+                }
+            } else {
+                val showHeaders = state.sigil == null
+                LazyColumn(Modifier.fillMaxWidth()) {
+                    for (group in state.groups) {
+                        if (showHeaders) {
+                            item(key = "header:${group.title}") {
+                                Text(
+                                    text = group.title,
+                                    style = MaterialTheme.typography.labelMedium,
+                                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                                    modifier = Modifier.padding(horizontal = 16.dp, vertical = 6.dp),
+                                )
+                            }
+                        }
+                        items(group.results, key = { rowKey(it.candidate) }) { result ->
+                            BarRow(
+                                candidate = result.candidate,
+                                nowMs = nowMs,
+                                onClick = { activate(result.candidate) },
+                                onLongClick = {
+                                    val session = (result.candidate as? BarCandidate.SessionItem)?.session
+                                    if (session != null) actionSession = session
+                                },
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    actionSession?.let { session ->
+        SessionActionMenu(
+            session = session,
+            onDismiss = { actionSession = null },
+            onRename = {
+                actionSession = null
+                renaming = session
+            },
+            onKill = {
+                actionSession = null
+                confirmingKill = session
+            },
+            onSpawnSimilar = {
+                actionSession = null
+                onDismiss()
+                onSpawnSimilar(session)
+            },
+        )
+    }
+
+    renaming?.let { session ->
+        RenameDialog(
+            initial = customSessionName(session) ?: "",
+            onCommit = {
+                renaming = null
+                viewModel.rename(session, it)
+            },
+            onCancel = { renaming = null },
+        )
+    }
+
+    confirmingKill?.let { session ->
+        KillConfirmDialog(
+            session = session,
+            onConfirm = {
+                confirmingKill = null
+                viewModel.kill(session)
+            },
+            onCancel = { confirmingKill = null },
+        )
+    }
+}
+
+private fun placeholderFor(sigil: BarSigil?): String = when (sigil) {
+    BarSigil.Commands -> "Run a command…"
+    BarSigil.Directories -> "Spawn in a directory…"
+    null -> "Go to a session…"
+}
+
+private fun rowKey(candidate: BarCandidate): String = when (candidate) {
+    is BarCandidate.SessionItem -> "session:${candidate.session.id}"
+    is BarCandidate.CommandItem -> "command:${candidate.command.id}"
+    is BarCandidate.DirectoryItem -> "directory:${candidate.path}"
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+private fun BarRow(
+    candidate: BarCandidate,
+    nowMs: Long,
+    onClick: () -> Unit,
+    onLongClick: () -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .combinedClickable(onClick = onClick, onLongClick = onLongClick)
+            .padding(horizontal = 16.dp, vertical = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        when (candidate) {
+            is BarCandidate.SessionItem -> {
+                ActivityRail(activity = candidate.session.activity, modifier = Modifier.height(36.dp))
+                Spacer(Modifier.width(8.dp))
+                Column(Modifier.fillMaxWidth()) {
+                    Text(
+                        text = sessionName(candidate.session),
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                        style = MaterialTheme.typography.bodyMedium,
+                    )
+                    MetaLine(session = candidate.session, nowMs = nowMs)
+                }
+            }
+            is BarCandidate.CommandItem -> {
+                Text(
+                    text = candidate.command.label,
+                    style = MaterialTheme.typography.bodyMedium,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+            }
+            is BarCandidate.DirectoryItem -> {
+                Text(
+                    text = candidate.display,
+                    style = MaterialTheme.typography.bodyMedium,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+            }
+        }
+    }
+}
+
+/** Long-press's action menu (docs/COMMAND-BAR.md, "Drill-in"), collapsed from
+ * the desktop clients' fuzzy-searchable action page to a plain dialog — a
+ * touch long-press already named the one session being acted on, so there is
+ * nothing left to search. */
+@Composable
+private fun SessionActionMenu(
+    session: Session,
+    onDismiss: () -> Unit,
+    onRename: () -> Unit,
+    onKill: () -> Unit,
+    onSpawnSimilar: () -> Unit,
+) {
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(sessionName(session)) },
+        text = {
+            Column {
+                TextButton(onClick = onRename, modifier = Modifier.fillMaxWidth()) { Text("Rename") }
+                TextButton(onClick = onSpawnSimilar, modifier = Modifier.fillMaxWidth()) { Text("Spawn similar") }
+                TextButton(onClick = onKill, modifier = Modifier.fillMaxWidth()) { Text("Kill") }
+            }
+        },
+        confirmButton = {},
+        dismissButton = { TextButton(onClick = onDismiss) { Text("Cancel") } },
+    )
+}
+
+@Composable
+private fun RenameDialog(initial: String, onCommit: (String) -> Unit, onCancel: () -> Unit) {
+    var text by remember { mutableStateOf(initial) }
+    AlertDialog(
+        onDismissRequest = onCancel,
+        title = { Text("Rename session") },
+        text = {
+            OutlinedTextField(
+                value = text,
+                onValueChange = { text = it },
+                singleLine = true,
+                keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
+            )
+        },
+        confirmButton = { TextButton(onClick = { onCommit(text.trim()) }) { Text("Rename") } },
+        dismissButton = { TextButton(onClick = onCancel) { Text("Cancel") } },
+    )
+}
+
+@Composable
+private fun KillConfirmDialog(session: Session, onConfirm: () -> Unit, onCancel: () -> Unit) {
+    val blockers = sessionBlockers(session)
+    AlertDialog(
+        onDismissRequest = onCancel,
+        title = { Text("Kill “${sessionName(session)}”?") },
+        text = {
+            Text(
+                if (blockers != null) {
+                    "This worktree has unsaved work: ${formatInTheWay(blockers)}. Killing may be refused unless forced."
+                } else {
+                    "This ends the session's process. This can't be undone."
+                },
+            )
+        },
+        confirmButton = { TextButton(onClick = onConfirm) { Text("Kill") } },
+        dismissButton = { TextButton(onClick = onCancel) { Text("Cancel") } },
+    )
+}

android/app/src/main/java/pt/naps/maestro/ui/commandbar/CommandBarViewModel.kt

@@ -0,0 +1,135 @@
+package pt.naps.maestro.ui.commandbar
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import pt.naps.maestro.api.MaestroClient
+import pt.naps.maestro.connection.CatalogStore
+import pt.naps.maestro.data.Session
+
+/** Quiet period before a typed `~` path is probed over `GET /api/dirs`,
+ * mirroring the spawn form's own autocomplete debounce. */
+private const val PROBE_DEBOUNCE_MS = 250L
+
+data class CommandBarUiState(
+    val query: String = "",
+    val sigil: BarSigil? = null,
+    val groups: List<BarGroup> = emptyList(),
+)
+
+/**
+ * Search logic behind [pt.naps.maestro.ui.commandbar.CommandBarSheet]
+ * (#270): folds the live session catalog, the fixed `>` command registry and
+ * the `~` directory list into one ranked, grouped result set as the query
+ * changes. A plain class, not an `androidx.lifecycle.ViewModel` — same shape
+ * as [pt.naps.maestro.ui.spawn.SpawnViewModel], which this otherwise mirrors.
+ */
+class CommandBarViewModel(
+    private val catalogStore: CatalogStore,
+    private val client: MaestroClient,
+    private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.IO),
+) {
+    private val _state = MutableStateFlow(CommandBarUiState())
+    val state: StateFlow<CommandBarUiState> = _state.asStateFlow()
+
+    private var homeDir: String = ""
+    private var recentDirectories: List<BarCandidate.DirectoryItem> = emptyList()
+    private var probedDirectories: List<BarCandidate.DirectoryItem> = emptyList()
+    private var recentDirectoriesLoaded = false
+    private var probeJob: Job? = null
+
+    init {
+        scope.launch {
+            homeDir = runCatching { client.getDaemonInfo().home_dir }.getOrDefault("")
+            recompute()
+        }
+        scope.launch {
+            catalogStore.sessions.collect { recompute() }
+        }
+    }
+
+    fun onQueryChange(raw: String) {
+        _state.update { it.copy(query = raw, sigil = parseBarQuery(raw).sigil) }
+        val parsed = parseBarQuery(raw)
+        if (parsed.sigil is BarSigil.Directories) {
+            ensureRecentDirectoriesLoaded()
+            probeTypedDirectory(parsed.query)
+        }
+        recompute()
+    }
+
+    /** `PATCH /api/sessions/:id`. Fire-and-forget: the catalog reflects the
+     * rename over the events socket like any other client's edit. */
+    fun rename(session: Session, name: String) {
+        scope.launch { runCatching { client.renameSession(session.id, name) } }
+    }
+
+    /** `DELETE /api/sessions/:id`, unforced — the same default the sidebar's
+     * own kill confirmation uses. */
+    fun kill(session: Session) {
+        scope.launch { runCatching { client.killSession(session.id) } }
+    }
+
+    private fun ensureRecentDirectoriesLoaded() {
+        if (recentDirectoriesLoaded) return
+        recentDirectoriesLoaded = true
+        scope.launch {
+            val recents = runCatching { client.recentDirs().dirs.map { it.cwd } }.getOrDefault(emptyList())
+            val projects = runCatching { client.listProjects().map { it.path } }.getOrDefault(emptyList())
+            recentDirectories = directoryCandidates(recents + projects, homeDir)
+            recompute()
+        }
+    }
+
+    /** Fills the `~` list in as a path is typed, the way the spawn form's own
+     * autocomplete does: the directory named so far is listed and its
+     * children join the candidates. */
+    private fun probeTypedDirectory(query: String) {
+        val slash = query.lastIndexOf('/')
+        if (slash < 0) {
+            probedDirectories = emptyList()
+            probeJob?.cancel()
+            return
+        }
+        val dir = expandHome(query.substring(0, slash + 1), homeDir)
+        probeJob?.cancel()
+        probeJob = scope.launch {
+            delay(PROBE_DEBOUNCE_MS)
+            val entries = runCatching { client.listDir(dir).entries }.getOrDefault(emptyList())
+            probedDirectories = directoryCandidates(entries.map { "$dir$it" }, homeDir)
+            recompute()
+        }
+    }
+
+    private fun directoryListCandidates(): List<BarCandidate> {
+        val seen = LinkedHashSet<String>()
+        val out = mutableListOf<BarCandidate.DirectoryItem>()
+        for (candidate in recentDirectories + probedDirectories) {
+            if (seen.add(candidate.path)) out += candidate
+        }
+        return out
+    }
+
+    private fun recompute() {
+        val raw = _state.value.query
+        val parsed = parseBarQuery(raw)
+        val candidates: List<BarCandidate> = when (parsed.sigil) {
+            is BarSigil.Commands -> BAR_COMMANDS.map { BarCandidate.CommandItem(it) }
+            is BarSigil.Directories -> directoryListCandidates()
+            null -> {
+                val sessions = orderSessionsForBar(catalogStore.sessions.value.values.toList())
+                    .map { BarCandidate.SessionItem(it) }
+                if (parsed.query.isEmpty()) sessions else sessions + BAR_COMMANDS.map { BarCandidate.CommandItem(it) }
+            }
+        }
+        val ranked = rankCandidates(parsed.query, candidates, homeDir)
+        _state.update { it.copy(groups = groupResults(ranked)) }
+    }
+}

android/app/src/test/java/pt/naps/maestro/ui/commandbar/CommandBarModelTest.kt

@@ -0,0 +1,134 @@
+package pt.naps.maestro.ui.commandbar
+
+import kotlinx.serialization.json.JsonPrimitive
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import pt.naps.maestro.data.Session
+import pt.naps.maestro.data.SessionStatus
+
+private fun session(
+    id: String,
+    name: String = id,
+    command: String = "bash",
+    cwd: String = "/home/user/project",
+    status: SessionStatus = SessionStatus.Running,
+    createdAt: String = "2026-01-01T00:00:00Z",
+    lastFocusedAt: String? = null,
+) = Session(
+    id = id,
+    cwd = cwd,
+    command = command,
+    metadata = mapOf("name" to JsonPrimitive(name)),
+    status = status,
+    created_at = createdAt,
+    last_focused_at = lastFocusedAt,
+)
+
+class CommandBarModelTest {
+    @Test
+    fun `a sigil is only read in first position`() {
+        assertEquals(BarSigil.Commands, parseBarQuery(">quit").sigil)
+        assertEquals("quit", parseBarQuery(">quit").query)
+        assertEquals(BarSigil.Directories, parseBarQuery("~/dev").sigil)
+        assertEquals("/dev", parseBarQuery("~/dev").query)
+        assertNull(parseBarQuery("foo>bar").sigil)
+        assertEquals("foo>bar", parseBarQuery("foo>bar").query)
+    }
+
+    @Test
+    fun `backspacing past a sigil returns the mixed list`() {
+        assertNull(parseBarQuery("").sigil)
+        assertEquals("", parseBarQuery("").query)
+    }
+
+    @Test
+    fun `most recently focused session sorts first`() {
+        val a = session("a", lastFocusedAt = "2026-01-01T00:00:00Z")
+        val b = session("b", lastFocusedAt = "2026-01-02T00:00:00Z")
+        assertEquals(listOf(b, a), orderSessionsForBar(listOf(a, b)))
+    }
+
+    @Test
+    fun `a never-focused session sorts after every focused one`() {
+        val focused = session("a", lastFocusedAt = "2026-01-01T00:00:00Z")
+        val neverFocused = session("b", createdAt = "2026-01-05T00:00:00Z")
+        assertEquals(listOf(focused, neverFocused), orderSessionsForBar(listOf(neverFocused, focused)))
+    }
+
+    @Test
+    fun `among never-focused sessions the most recently created sorts first`() {
+        val older = session("a", createdAt = "2026-01-01T00:00:00Z")
+        val newer = session("b", createdAt = "2026-01-02T00:00:00Z")
+        assertEquals(listOf(newer, older), orderSessionsForBar(listOf(older, newer)))
+    }
+
+    @Test
+    fun `dead sessions sort last regardless of recency`() {
+        val dead = session("a", status = SessionStatus.Dead, lastFocusedAt = "2026-01-09T00:00:00Z")
+        val alive = session("b", lastFocusedAt = "2026-01-01T00:00:00Z")
+        assertEquals(listOf(alive, dead), orderSessionsForBar(listOf(dead, alive)))
+    }
+
+    @Test
+    fun `abbreviateCwd replaces the home prefix`() {
+        assertEquals("~/dev/api", abbreviateCwd("/home/user/dev/api", "/home/user"))
+        assertEquals("~", abbreviateCwd("/home/user", "/home/user"))
+        assertEquals("/var/lib", abbreviateCwd("/var/lib", "/home/user"))
+    }
+
+    @Test
+    fun `expandHome inverts abbreviateCwd`() {
+        assertEquals("/home/user/dev/api", expandHome("~/dev/api", "/home/user"))
+        assertEquals("/home/user", expandHome("~", "/home/user"))
+    }
+
+    @Test
+    fun `an empty query matches every candidate at score 0 in input order`() {
+        val a = BarCandidate.SessionItem(session("a"))
+        val b = BarCandidate.SessionItem(session("b"))
+        val results = rankCandidates("", listOf(a, b), homeDir = "")
+        assertEquals(listOf(a, b), results.map { it.candidate })
+        assertTrue(results.all { it.score == 0 })
+    }
+
+    @Test
+    fun `a query matching nothing returns an empty list`() {
+        val candidates = listOf(BarCandidate.SessionItem(session("a", command = "bash")))
+        assertTrue(rankCandidates("zzz", candidates, homeDir = "").isEmpty())
+    }
+
+    @Test
+    fun `an exact name match outranks a session found through its directory`() {
+        val api = BarCandidate.SessionItem(session("api", cwd = "/home/user/web"))
+        val worker = BarCandidate.SessionItem(session("worker", cwd = "/home/user/api"))
+        val results = rankCandidates("api", listOf(api, worker), homeDir = "")
+        assertEquals(listOf(api, worker), results.map { it.candidate })
+        assertEquals("name", results[0].matchedField)
+        assertEquals("directory", results[1].matchedField)
+    }
+
+    @Test
+    fun `a session beats a command of equal score, kind order tie-break`() {
+        val sessionItem = BarCandidate.SessionItem(session("kill"))
+        val command = BarCandidate.CommandItem(BarCommand(id = "kill", label = "kill"))
+        val results = rankCandidates("kill", listOf(command, sessionItem), homeDir = "")
+        assertEquals(listOf(sessionItem, command), results.map { it.candidate })
+    }
+
+    @Test
+    fun `groups are ordered by their best-scoring member and drop empty kinds`() {
+        val sessionItem = BarCandidate.SessionItem(session("web-search"))
+        val command = BarCandidate.CommandItem(BarCommand(id = "spawn", label = "Spawn session"))
+        val ranked = rankCandidates("web", listOf(command, sessionItem), homeDir = "")
+        val groups = groupResults(ranked)
+        assertEquals(listOf("Sessions"), groups.map { it.title })
+    }
+
+    @Test
+    fun `a fuzzy subsequence still matches out of order characters`() {
+        val candidate = BarCandidate.SessionItem(session("maestro-tui"))
+        assertTrue(rankCandidates("mtu", listOf(candidate), homeDir = "").isNotEmpty())
+    }
+}