fix: keep work-status panel reachable when all sections are hidden (#2805)

* fix: keep work-status panel reachable when all sections are hidden

When every section was unchecked in the Panel Sections dialog, the panel
went transparent and inert, making the settings gear icon unreachable.
The only recovery was knowing to toggle the panel off and on from the
header, which still rendered the same empty/inert state.

Changes:
- Panel stays interactive (not inert) when visible, even with zero
  rendered sections. This matches how other panels in the app use inert
  only for visually-collapsed (width/height = 0) states.
- Empty state shows 'No sections selected' with a link to reopen the
  sections dialog, matching the centered text-muted-foreground pattern
  used by the file tree, review panel, and home page empty states.
- Sections dialog gains a 'Show all' link (visible whenever any section
  is hidden) and a warning when all sections are unchecked, matching the
  keybinds settings 'Reset to defaults' pattern.
- Added i18n keys to all 10 locale files (English fallback).

Fixes #2804

* Round 1: fix interactive guard for fresh-mount; translate i18n keys

Address openchamber-bot review findings:

1. (blocker) Replace English fallback strings in all 10 non-English
   locale files with real translations per locale-ui-patterns guidance.

2. (non-blocker) Restore the renderedSections > 0 guard for the
   transient no-data-on-mount state so the panel doesn't flash a bare
   bordered card. The interactive condition is now:
     visible && (renderedSections > 0 || allSectionsHidden)
   Empty-state rendering is gated on allSectionsHidden alone (not
   renderedSections === 0) so it works correctly on fresh mount when
   all sections were already hidden in persisted settings.

Validation:
  tsc --noEmit: 0 errors
  bun test work-status: 34 pass, 0 fail

* Round 2: use .every() guard, dedup chooseLabel key, add tests

1. Replace >= length check with areAllWorkStatusSectionsHidden() helper
   that uses .every() — stale section ids left in persisted settings
   from a future removal can no longer inflate the count.

2. Remove duplicate chooseLabel i18n key from all 11 locales — the
   empty-state link now reuses the existing sections.open key.

3. Add 6 focused tests for areAllWorkStatusSectionsHidden covering
   empty, null/undefined, partial, full, stale-id, and stale+full.

Validation:
  tsc --noEmit: 0 errors
  bun test work-status: 40 pass (6 new), 0 fail

packages/ui/src/components/chat/work-status/sections.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, test } from 'bun:test';
 import {
   WORK_STATUS_SECTION_IDS,
   WORK_STATUS_SECTION_LABEL_KEYS,
+  areAllWorkStatusSectionsHidden,
   isWorkStatusSectionVisible,
   sanitizeWorkStatusHiddenSections,
 } from './sections';
@@ -30,6 +31,37 @@ describe('isWorkStatusSectionVisible', () => {
   });
 });
 
+describe('areAllWorkStatusSectionsHidden', () => {
+  test('returns false when no sections are hidden', () => {
+    expect(areAllWorkStatusSectionsHidden([])).toBe(false);
+  });
+
+  test('returns false for null and undefined', () => {
+    expect(areAllWorkStatusSectionsHidden(null)).toBe(false);
+    expect(areAllWorkStatusSectionsHidden(undefined)).toBe(false);
+  });
+
+  test('returns false when only some sections are hidden', () => {
+    expect(areAllWorkStatusSectionsHidden(['usage', 'tasks'])).toBe(false);
+  });
+
+  test('returns true when every known section is hidden', () => {
+    expect(areAllWorkStatusSectionsHidden([...WORK_STATUS_SECTION_IDS])).toBe(true);
+  });
+
+  test('ignores stale ids that are no longer in the section list', () => {
+    // A future section-ID removal should not trick the length check into
+    // reporting all-hidden when real sections are still visible.
+    const withStale = [...WORK_STATUS_SECTION_IDS.slice(0, -1), 'removed_section'];
+    expect(areAllWorkStatusSectionsHidden(withStale)).toBe(false);
+  });
+
+  test('returns true even with extra stale ids alongside all real ones', () => {
+    const withExtra = [...WORK_STATUS_SECTION_IDS, 'removed_section'];
+    expect(areAllWorkStatusSectionsHidden(withExtra)).toBe(true);
+  });
+});
+
 describe('sanitizeWorkStatusHiddenSections', () => {
   test('keeps known ids and drops everything else', () => {
     expect(sanitizeWorkStatusHiddenSections(['usage', 'nope', 42, null, 'tasks']))