feat(session,mobile): auto-resume on usage limit + mobile view fixes

Auto-resume on usage limit ("token pause" control, opt-in checkbox at the
top of the Respawn tab, off by default):
- usage-limit-patterns.ts (new, pure): detects all Claude Code limit
  messages (1.0.x-2.1.x eras incl. "5-hour limit reached - resets 8pm",
  "You've hit your limit - resets 1:40pm (TZ)", weekly date forms, raw
  "usage limit reached|<epoch>") and parses the reset time. Conservative:
  no parseable future reset time, no action.
- SessionAutoOps: arms a timer at reset+2min, sends Esc (dismisses the
  rate-limit dialog) + "continue"; dedups footer redraws, retries every
  5min on stale times, cancels when Claude starts working, persists and
  re-arms across Codeman restarts (SessionState.autoResumeEnabled/At).
- Respawn guard: cycles are blocked while limit-paused so /clear cannot
  wipe the paused conversation (respawnBlocked reason 'usage_limit').
- POST /api/sessions/:id/auto-resume; SSE session:limitPauseScheduled/
  limitResume/limitResumeCancelled; toasts + status line in the modal.
- Respawn tab tidied: single-row prompt fields, merged behavior row.

Mobile fixes (0.9.8 regressions, user-reported):
- Resize arbitration is now activity-based: a desktop sizing claim only
  blocks phone resizes while the desktop typed within 90s
  (Session.DESKTOP_CLAIM_IDLE_MS). Idle desktop -> phone takes the pane;
  next desktop keystroke re-asserts the desktop layout server-side
  (noteDesktopActivity via ws-routes input). Phones re-send dims every
  30s (visible tab only, skipped while the keyboard is open) so attaching
  under a hot claim self-corrects. Fixes the desktop-width-stream-in-
  narrow-xterm soup (mid-word wraps, tmux dot fill, Ink overdraw).
- Cross-device reflows (takeover/re-assert) emit a debounced needsRefresh
  so all clients reload the buffer instead of stacking ghost Ink frames.
- Keyboard accessory/toolbar lift restored: measure keyboardOffset
  against window.innerHeight (layout viewport), not the shrunken .app -
  on iOS the offset computed to 0, leaving both bars hidden behind the
  OS keyboard with a dead gap above.
- Removed the mobile header utility ("three dots") toggle entirely;
  the headerRight tray stays collapsed on small viewports.

Tests: usage-limit-patterns (36), session-auto-resume (21), resize
arbitration (+6), session routes (+4), respawn guard (+2); MockSession
auto-resume/sizing stubs; mobile tabs test updated for toggle removal.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/web/public/styles.css

@@ -190,12 +190,6 @@ body {
   filter: brightness(1.1);
 }
 
-/* Mobile-only header utility toggle — hidden by default; the mobile/tablet
-   media queries in mobile.css (max-width: 768px) re-enable it as flex. */
-.mobile-header-utility-toggle {
-  display: none;
-}
-
 /* Session Tabs */
 .session-tabs {
   display: flex;
@@ -4676,6 +4670,39 @@ body.solo-mode .btn-lifecycle-log {
   margin-bottom: 0.25rem;
 }
 
+/* Auto-resume on usage limit (token pause control) */
+.auto-resume-box {
+  display: flex;
+  flex-direction: column;
+  gap: 0.3rem;
+  margin: 0.75rem 0;
+  padding: 0.6rem 0.75rem;
+  background: rgba(59, 130, 246, 0.07);
+  border: 1px solid rgba(59, 130, 246, 0.35);
+  border-radius: 6px;
+}
+
+.auto-resume-box .checkbox-inline {
+  font-size: 0.85rem;
+  font-weight: 500;
+  color: var(--text);
+}
+
+.auto-resume-box .form-hint {
+  margin-top: 0;
+}
+
+.auto-resume-status {
+  display: none;
+  font-size: 0.7rem;
+  font-weight: 600;
+  color: var(--accent-hover);
+}
+
+.auto-resume-status.active {
+  display: block;
+}
+
 /* Respawn actions in modal */
 .respawn-actions {
   display: flex;