chore: add plan files for Phase 2 enhanced features

plans/phase-2-enhanced-features/phase-6-integration.md

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+# Phase 5: Integration & Polish
+
+**Status:** ⬜ Not Started
+**Parent plan:** [PLAN.md](./PLAN.md)
+**Domain:** fullstack
+
+## Objective
+Integrate all Phase 2 features, fix all build/type/lint errors, write tests, and ensure everything works together.
+
+## Tasks
+
+- [ ] Task 1: Fix all TypeScript/build errors across the codebase
+- [ ] Task 2: Verify `npm run build` succeeds
+- [ ] Task 3: Verify `npm run check` passes
+- [ ] Task 4: Verify `npm run lint` passes
+- [ ] Task 5: Write tests for oauthService
+- [ ] Task 6: Write tests for new widget types (validators, rendering logic)
+- [ ] Task 7: Write tests for reorder APIs
+- [ ] Task 8: Write tests for board permissions API
+- [ ] Task 9: Update seed script with example data for new widget types
+- [ ] Task 10: Verify all existing tests still pass
+- [ ] Task 11: Update `.env.example` with all new env vars documented
+
+## Files to Modify/Create
+- Various source files — fix build errors
+- New test files for Phase 2 features
+- `prisma/seed.ts` — update
+- `.env.example` — update
+
+## Acceptance Criteria
+- `npm run build` succeeds
+- `npm run check` passes
+- `npm run lint` passes
+- `npm test` passes (existing + new tests)
+- All Phase 2 features work together
+- OAuth flow works end-to-end (when configured)
+- DnD reordering persists correctly
+- All widget types render and edit correctly
+- Board access control UI works with permission system
+
+## Notes
+- Big Bang convergence — fix everything here
+- Priority: build errors → type errors → lint → tests
+
+## Review Checklist
+- [ ] All tasks completed
+- [ ] Code follows project conventions
+- [ ] No unintended side effects
+- [ ] Build passes
+- [ ] Tests pass (new + existing)
+
+## Handoff
+<!-- Final phase — no handoff needed -->