feat(mobile): mobile app navigation rework and beta-feedback closeout (#2561)

Navigation model rebuilt around two full-width drawers and a minimal
header (sessions / title-switcher / usage ring / workspace):

- Left sessions drawer: cross-project tree with live status indicators,
  swipe actions on sessions (rename/archive/delete) and on group headers
  (project edit / two-step close, worktree delete), reorder-only edit
  mode with collapsible project cards and draggable worktrees, app-level
  footer (connected instance, settings, pending web update).
- Right workspace drawer: Changes / Files / Terminal / Notes / MCP as
  pill tabs (inactive tabs icon-only); panes stay mounted once visited.
  The full desktop file editor serves the Files tab; read/skill tool taps
  in chat open the file there at the requested line.
- Header session switcher on title tap: 10 cross-project recents with
  live busy/attention indicators and project · branch metadata; the
  usage ring opens a metadata overlay with an explicit loading state.
- The overflow menu is gone on phones (its destinations moved into the
  drawers); iPad keeps it until its dedicated layout pass.

Correctness and continuity:

- /auth/session answers bearer-first, so a stale WebView cookie can no
  longer mask a revoked device token; cold launches classify failures
  fast and land on an explicit connect screen.
- Authoritative session snapshots raise frozen ordering baselines and
  stale live ranks — recents stay truthful after the app slept.
- Cold launches reopen the last active session per instance (persisted
  pointer, confirmed against a sessions snapshot; a user-opened draft
  clears it), with a logo hold instead of a draft flash.

Also: collapsed pill composer gains the stop control; chat tool rows
share one 36px rhythm; Task subtool rows truncate; larger bottom safe
area so the composer clears big-screen corner radii; Capacitor build
hides About/Update (store updates apply there); widgets link to the
sessions drawer with a list icon; MobileApp split into focused modules;
five mobile-surface detectors unified; translucent borders normalized to
70%; all new strings translated across the 10 locales.

iPad and foldable layouts are intentionally untouched - separate next version PR.

packages/ui/src/components/chat/StatusRow.tsx

@@ -305,7 +305,13 @@ export const StatusRow: React.FC<StatusRowProps> = ({
   }
 
   return (
-    <div className={cn("mb-1", !hasLeftAccessory && "chat-column")} style={STATUS_ROW_CONTAINER_STYLE}>
+    <div
+      // Mobile: breathing room between the last message and the agent status
+      // line — without it the "<model> is running…" row sits flush against
+      // the message above.
+      className={cn("mb-1", isMobile && "mt-2", !hasLeftAccessory && "chat-column")}
+      style={STATUS_ROW_CONTAINER_STYLE}
+    >
       <div className={cn("flex items-center justify-between py-0.5 gap-2 h-[1.2rem]", hasLeftAccessory && "px-0.5")}>
         {/* Left: Abort status | Working placeholder | leftAccessory */}
         <div className={cn("flex-1 flex items-center min-w-0 gap-2", hasLeftAccessory ? "pl-1.5" : "overflow-x-hidden")}>