feat(tui-go): command-palette keybinds + configurable status bar

Palette: each command now shows its bare-key shortcut in a key column (and the filter
matches on it), so the palette teaches the shortcuts instead of hiding them.

Status bar: a new "status bar" palette command opens a toggle overlay to show/hide the
non-essential segments (current stage, session status, workspace path, model, last-event
clock, resource gauge); correx/connection/session-name/spinner stay. Choices persist
TUI-local in tui-prefs.json (JSON in the config dir — display state, kept out of the
shared/replayed server config) and reload on launch.

Also trims the in-session footer (drops stats/model — both reachable via `p cmds`) so it
no longer overflows + truncates `q quit` at ~100 cols after the transcript-nav additions.
Tests cover toggle→render gating and prefs persistence; verified via cmd/preview renders.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/tui-go/internal/app/model.go

@@ -58,6 +58,7 @@ const (
 	OverlayIdeas
 	OverlaySessions
 	OverlayFiles
+	OverlayStatusbar
 )
 
 // RouterEntry is one line in a session's conversation transcript.
@@ -188,11 +189,11 @@ type Session struct {
 	// PendingQueue[PendingIdx] (kept in sync by syncPending) so the render code can
 	// keep reading a single pointer while multiple gates queue up behind it.
 	Pending      *Approval
-	PendingQueue []*Approval // all pending gates, oldest first; navigated with ↑/↓
-	PendingIdx   int         // selected index into PendingQueue
+	PendingQueue []*Approval    // all pending gates, oldest first; navigated with ↑/↓
+	PendingIdx   int            // selected index into PendingQueue
 	Clar         *Clarification // open questions awaiting answers (clarification view)
-	Propose       *Proposal      // router workflow suggestion awaiting a pick (propose view)
-	Active        bool           // an inference/tool is in flight (drives the spinner)
+	Propose      *Proposal      // router workflow suggestion awaiting a pick (propose view)
+	Active       bool           // an inference/tool is in flight (drives the spinner)
 }
 
 // Workflow is a launchable workflow advertised by the server.
@@ -314,6 +315,11 @@ type Model struct {
 	fileFilter   string // the query typed after @ (narrows the list)
 	fileIndex    int
 
+	// status-bar segment visibility (OverlayStatusbar) — persisted TUI-local in tui-prefs.json.
+	// A segment id present in sbHidden is hidden; absent = shown. sbIndex is the toggle cursor.
+	sbHidden map[string]bool
+	sbIndex  int
+
 	// animation
 	frame   int  // tick counter; drives spinner + caret blink
 	ticking bool // true while a tick loop is scheduled. The loop is gated on animating()
@@ -367,6 +373,7 @@ func NewModel(client *ws.Client) Model {
 		snapshotPhase:   true,
 		eventStripShown: true,
 		transcriptSel:   -1,
+		sbHidden:        loadStatusbarHidden(),
 	}
 }