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>

test/mobile/tabs.test.ts

@@ -132,54 +132,23 @@ describe('Tab Navigation', () => {
       expect(modalClass).toMatch(/active/);
     });
 
-    it('top-left mobile menu button opens the header utility tray', async () => {
+    it('header has no utility toggle and the tray stays collapsed on mobile', async () => {
+      // The three-dot header utility toggle was removed (owner decision,
+      // 2026-06-10): nothing interactive may occupy the top-left corner, and
+      // the headerRight tray stays collapsed (hidden) on small viewports.
       await page.evaluate(() => {
         document.querySelectorAll('.modal.active').forEach((modal) => modal.classList.remove('active'));
         document.getElementById('headerRight')?.classList.add('mobile-collapsed');
-        const toggle = document.getElementById('mobileHeaderUtilityToggle');
-        toggle?.classList.remove('active');
-        toggle?.setAttribute('aria-expanded', 'false');
       });
 
-      const topLeftElements = await page.evaluate(() => {
-        return document.elementsFromPoint(16, 16).map((el) => ({
-          tag: el.tagName,
-          id: el.id,
-          className: String(el.className),
-          closestButtonId: el.closest('button')?.id ?? '',
-        }));
-      });
+      const toggleCount = await page.locator('#mobileHeaderUtilityToggle').count();
+      expect(toggleCount).toBe(0);
 
-      expect(topLeftElements[0]?.closestButtonId).toBe('mobileHeaderUtilityToggle');
-
-      const toggleBox = await page.locator('#mobileHeaderUtilityToggle').boundingBox();
-      expect(toggleBox?.width ?? 0).toBeGreaterThanOrEqual(44);
-      expect(toggleBox?.height ?? 0).toBeGreaterThanOrEqual(44);
-
-      await page.touchscreen.tap(
-        (toggleBox?.x ?? 0) + (toggleBox?.width ?? 0) / 2,
-        (toggleBox?.y ?? 0) + (toggleBox?.height ?? 0) / 2
-      );
-      await page.waitForTimeout(150);
-
-      const trayClass = await page.locator('#headerRight').getAttribute('class');
-      const expanded = await page.locator('#mobileHeaderUtilityToggle').getAttribute('aria-expanded');
-      const trayBox = await page.locator('#headerRight').boundingBox();
-      const topTrayElement = await page.evaluate(() => {
+      const trayVisible = await page.evaluate(() => {
         const tray = document.getElementById('headerRight');
-        const rect = tray?.getBoundingClientRect();
-        if (!rect) return '';
-        return (
-          document
-            .elementsFromPoint(rect.left + Math.min(24, rect.width / 2), rect.top + Math.min(24, rect.height / 2))
-            .find((el) => el.id === 'headerRight' || el.closest?.('#headerRight'))
-            ?.closest?.('#headerRight')?.id ?? ''
-        );
+        return tray ? getComputedStyle(tray).display !== 'none' : false;
       });
-      expect(trayClass).not.toMatch(/mobile-collapsed/);
-      expect(expanded).toBe('true');
-      expect(trayBox?.x ?? 9999).toBeLessThanOrEqual((toggleBox?.x ?? 0) + (toggleBox?.width ?? 0) + 8);
-      expect(topTrayElement).toBe('headerRight');
+      expect(trayVisible).toBe(false);
     });
 
     it('tabs remain visible on large phone and tablet headers', async () => {