feat(tui-go): session list / resume view (E)

R opens a navigable overlay of recent sessions (GET /sessions: short id, status,
workflow/stage, relative age); enter resumes via POST /sessions/{id}/resume, which
replays onto the existing global /stream (no WS re-dial). Fetch/resume errors surface
in the overlay, never panic. stdlib-only (ws.Client.HTTPBase derives the base URL).

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

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

@@ -51,12 +51,37 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.applyServerPhased(msg.m)
 		return m, readServer(m.client)
 
+	case sessionsLoadedMsg:
+		m.applySessionsLoaded(msg)
+		return m, nil
+
+	case sessionResumeMsg:
+		if msg.err != "" {
+			m.sessionListErr = "resume: " + msg.err
+		}
+		return m, nil
+
 	case tea.KeyMsg:
 		return m.handleKey(msg)
 	}
 	return m, nil
 }
 
+// applySessionsLoaded folds a GET /sessions result into the browser, clamping the
+// cursor and surfacing any fetch error in place of a crash.
+func (m *Model) applySessionsLoaded(msg sessionsLoadedMsg) {
+	m.sessionListLoading = false
+	if msg.err != "" {
+		m.sessionListErr = msg.err
+		return
+	}
+	m.sessionListErr = ""
+	m.sessionList = msg.sessions
+	if m.sessionListIndex >= len(m.sessionList) {
+		m.sessionListIndex = 0
+	}
+}
+
 func (m *Model) applyConn(s ws.Status) {
 	switch {
 	case s.Connected:
@@ -178,6 +203,10 @@ func (m Model) handleNormalKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 		m.openArtifacts()
 	case "I":
 		m.openIdeas()
+	case "R":
+		// Resume browser: recent sessions over HTTP, reachable even after a server
+		// restart + TUI reopen (the live stream only carries running sessions).
+		return m, m.openSessions()
 	case "S":
 		m.openStats()
 	case "g":
@@ -359,6 +388,11 @@ func (m Model) handleOverlayKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 	if m.overlay == OverlayConfig {
 		return m.handleConfigKey(k)
 	}
+	// Sessions overlay owns all its keys: enter resumes (emits a cmd), so it can't
+	// share the generic no-cmd esc path below.
+	if m.overlay == OverlaySessions {
+		return m.handleSessionsKey(k)
+	}
 	if k.Type == tea.KeyEsc {
 		m.overlay = OverlayNone
 		return m, nil
@@ -566,6 +600,7 @@ func paletteCommands() []paletteCmd {
 		{"events", "event inspector", "browse the event stream"},
 		{"artifacts", "view artifacts", "browse this session's artifacts"},
 		{"stats", "session stats", "metrics for the selected session"},
+		{"sessions", "resume session", "browse / resume recent sessions"},
 		{"config", "edit config", "view / change correx settings"},
 		{"mode", "toggle mode", "switch chat / steering"},
 		{"cancel", "cancel session", "stop the selected session"},
@@ -605,6 +640,8 @@ func (m Model) execPalette(id string) (tea.Model, tea.Cmd) {
 		m.openArtifacts()
 	case "stats":
 		m.openStats()
+	case "sessions":
+		return m, m.openSessions()
 	case "config":
 		m.openConfig()
 	case "mode":