fix: improve combat-happy-path e2e test reliability and speed

- Add data-testid attributes to debug tab buttons (Fill Mana, +10K, +1K, discipline rows)
- Add runTicks(n) to debugBridge for fast-forwarding game ticks in E2E tests
- Fix Step 2: use data-testid selectors instead of fragile DOM traversal for discipline buttons
- Fix Step 4: replace 120s waitForTimeout with runTicks(6000) for deterministic combat
- Fix Step 5: replace 60s waitForTimeout with runTicks(3000)
- Fix Step 6: verify floor decrements after each Climb Down click using waitForFunction
- Fix Step 7: verify Exit Spire button visibility is gated on floor 1
- Remove leftover debug logging (btnInfo DOM inspection)

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-06-02T08:49:49.529Z",
+    "generated": "2026-06-02T11:55:03.952Z",
     "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."
   },