feat: recreate Debug Tab with modular debugging functions

- Add DebugTab.tsx as main container with collapsible sections
- Add 8 debug section components in DebugTab/ subdirectory:
  - GameStateDebugSection: reset, mana, time, pause controls
  - DisciplineDebugSection: activate/deactivate, add XP
  - AttunementDebugSection: unlock, add XP
  - ElementDebugSection: unlock all, add elemental mana
  - GolemDebugSection: enable/disable golems
  - PactDebugSection: force sign/clear pacts
  - SpireDebugSection: jump floors, toggle spire mode
  - AchievementDebugSection: unlock/reset achievements
- Add DebugTab to barrel export (tabs/index.ts)
- Add lazy-loaded Debug tab to page.tsx
- Add DebugTab.test.ts with 45 tests
- All files under 400 lines
- Uses existing debug context (DebugProvider, DebugName)
- Destructive actions require confirmation (double-click pattern)

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-05-19T11:53:36.198Z",
+    "generated": "2026-05-19T12:44:30.633Z",
     "description": "Import dependency graph for src/lib/game. Keys are files, values are arrays of files they import.",
     "usage": "To find what a file affects, search for its path in the VALUES. To find what a file depends on, look at its KEY entry."
   },