tab-close + chat archive/delete + landing-card buttons + 1000px content cap

Feature 1 — Tab close menu (pure local pane state, no API):
- ChatTabBar context menu: Rename / sep / Close / Close others / Close to right / Close all
- Workspace bulk-tab primitives: closeOtherTabs, closeTabsToRight, closeAllTabs (manipulate panes[].chatIds, no fetch)
- Drop in-bar Delete; landing card's name-typed Delete is the canonical destructive path

Feature 2 — Chat archive + delete:
- chats.status vocabulary aligned with projects ('open' | 'archived'); DROP old inline CHECK, UPDATE 'closed' → 'archived', ADD new named chats_status_chk
- POST /api/chats/:id/archive (204) + POST /api/chats/:id/unarchive (200) + GET /api/sessions/:id/chats?status=archived; DELETE publishes chat_deleted; PATCH simplified to name-only
- 3 new WS frames: chat_archived, chat_unarchived, chat_deleted (renamed from chat_closed)
- Same dedup discipline: server-only publish, no local sessionEvents.emit in client
- SessionLandingPage: right-click ContextMenu (Open / Rename / Archive / sep / Delete-destructive), inline rename, archive confirm dialog, delete dialog with name-typed Input gated until typed text === chat.name, Archived chats collapsible section with Restore
- Card-level Archive + Delete icon buttons reusing the same dialog state setters; stopPropagation on both so card click still opens the chat; archived cards keep only Restore

UX — chat content width cap:
- ChatPane content (MessageList, queue chips, stop button, ChatInput) wrapped in inner max-w-[1000px] mx-auto w-full so messages center; outer border-t / scroll containers stay full-width so pane chrome and backgrounds remain edge-to-edge
- No new deps, no media queries (narrow viewports collapse to width naturally)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/server/src/schema.sql

@@ -77,7 +77,7 @@ CREATE TABLE IF NOT EXISTS chats (
   id           UUID PRIMARY KEY DEFAULT gen_random_uuid(),
   session_id   UUID NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
   name         TEXT,
-  status       TEXT NOT NULL DEFAULT 'open' CHECK (status IN ('open', 'closed')),
+  status       TEXT NOT NULL DEFAULT 'open' CHECK (status IN ('open', 'archived')),
   created_at   TIMESTAMPTZ NOT NULL DEFAULT clock_timestamp(),
   updated_at   TIMESTAMPTZ NOT NULL DEFAULT clock_timestamp()
 );
@@ -144,3 +144,17 @@ BEGIN
       CHECK (status IN ('open', 'archived'));
   END IF;
 END $$;
+
+-- v1.3-tab-close-chat-archive: align chats.status vocabulary with projects ('archived' not 'closed')
+-- KEEP IN SYNC: apps/server/src/types/api.ts CHAT_STATUSES
+-- Order matters: (1) drop the OLD inline CHECK that only allowed ('open','closed');
+-- (2) migrate existing rows; (3) add new named CHECK allowing ('open','archived').
+ALTER TABLE chats DROP CONSTRAINT IF EXISTS chats_status_check;
+UPDATE chats SET status = 'archived' WHERE status = 'closed';
+DO $$
+BEGIN
+  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'chats_status_chk') THEN
+    ALTER TABLE chats ADD CONSTRAINT chats_status_chk
+      CHECK (status IN ('open', 'archived'));
+  END IF;
+END $$;