fix(ci): restore full-suite after verification request + lucide mock gaps (#2332)

## Summary

Main Full Suite shards have been red after recent landings. Root causes:

1. **Executor tests** — `execute()` now polls
`getTaskVerificationRequestAsync` (chat-enqueued verification). Shared
`createMockStore()` (and soft-delete inline store) lacked the method, so
nearly every execute-path suite failed with `is not a function`.
2. **TaskDetailModal suites** — `NativeStructurePreview` imports `Map` /
`Lightbulb` / `BarChart3` / `Target` / `CircleAlert` from lucide; the
shared TaskDetail lucide mock omitted them, so suites failed at import.
3. **Grok process-lifecycle** — 15s bound stress timed out under
full-suite load without product-bug evidence → quarantined on sight per
AGENTS.md.

## Test plan

- [x] `executor-task-done-blocked`, `executor-fast-mode-workflows`,
concurrent-execute race
- [x] `executor-step-session`, plan-only scope leak, review-step
indexing
- [x] `TaskDetailModal.create-pr` + `TaskDetail.mobile-transition`
- [ ] Full Suite CI on this PR

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Improvements**
* Added `html2canvas` support in the dashboard to enable HTML-to-canvas
rendering needed for visual structure previews.
* **Tests**
* Updated task execution test mocks to handle task verification-request
flows reliably.
* Improved task deletion safeguard coverage and related execution
behavior checks.
* Enhanced test stubs to support structure preview rendering elements
during modal-related tests.
* **Chores**
* Quarantined a timing-sensitive process lifecycle test and refreshed
quarantine tracking to improve full-suite stability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

scripts/lib/test-quarantine.json

@@ -23,7 +23,7 @@
     },
     {
       "file": "packages/dashboard/src/__tests__/dev-server-process.test.ts",
-      "reason": "Full-suite shard 4 (run 29661202279): clears fallback probe timer when URL is detected from logs — detectedEvents length 0 under dashboard-api-quality-backfill load; known timer/stdout race (prior FN-6722 quarantine, FN-6860 rescue). Re-flaked without product-bug evidence. Quarantine on sight per AGENTS.md. Mirrored in packages/dashboard/vitest.config.ts.",
+      "reason": "Full-suite shard 4 (run 29661202279): clears fallback probe timer when URL is detected from logs \u2014 detectedEvents length 0 under dashboard-api-quality-backfill load; known timer/stdout race (prior FN-6722 quarantine, FN-6860 rescue). Re-flaked without product-bug evidence. Quarantine on sight per AGENTS.md. Mirrored in packages/dashboard/vitest.config.ts.",
       "quarantinedAt": "2026-07-18"
     },
     {
@@ -40,6 +40,11 @@
       "file": "packages/engine/src/__tests__/reliability-interactions/merge-reuse-task-worktree.slow.test.ts",
       "reason": "Full-suite engine-slow (run 29663725381): FN-5363 queue-head pollution handoff left leased merge-queue row after merge under load without product-bug evidence. Quarantine on sight per AGENTS.md. Mirrored in packages/engine/vitest.config.ts engine-slow exclude.",
       "quarantinedAt": "2026-07-18"
+    },
+    {
+      "file": "plugins/fusion-plugin-grok-runtime/src/__tests__/process-lifecycle.test.ts",
+      "reason": "Full-suite shard 4 (run 29671930241): process cleanup bound stress test timed out at 15s under package-lane load without product-bug evidence. Quarantine on sight per AGENTS.md. Mirrored in plugins/fusion-plugin-grok-runtime/vitest.config.ts.",
+      "quarantinedAt": "2026-07-19"
     }
   ]
 }