refactor(cursor-rules): restructure rules architecture with meta-rule system

- Reorganize cursor rules into logical domain-based directories
- Implement meta-rule system for workflow-specific rule bundling
- Move core rules to dedicated /core directory
- Consolidate development rules under /development namespace
- Add architectural patterns and implementation examples
- Create workflow-specific meta-rules for common development tasks
- Remove deprecated standalone rule files
- Update package dependencies for new rule structure

BREAKING CHANGE: Cursor rules file structure has been reorganized
Files moved from root rules directory to domain-specific subdirectories

.cursor/rules/app/architectural_implementation.mdc

@@ -0,0 +1,139 @@
+# Time Safari Architecture — Implementation Details
+
+> **Agent role**: Reference this file for detailed implementation details when
+  working with TimeSafari architecture implementation.
+
+## Error Handling
+
+- Global Vue error handler → logs with component name.
+
+- Platform-specific wrappers log API errors with platform prefix
+
+  (`[Capacitor API Error]`, etc).
+
+- Use structured logging (not `console.log`).
+
+## Best Practices
+
+- Keep platform code **isolated** in `platforms/`.
+
+- Always define a **shared interface** first.
+
+- Use feature detection, not platform detection, when possible.
+
+- Dependency injection for services → improves testability.
+
+- Maintain **Competence Hooks** in PRs (2–3 prompts for dev
+
+  discussion).
+
+## Dependency Management
+
+- Key deps: `@capacitor/core`, `electron`, `vue`.
+
+- Use conditional `import()` for platform-specific libs.
+
+## Security Considerations
+
+- **Permissions**: Always check + request gracefully.
+
+- **Storage**: Secure storage for sensitive data; encrypt when possible.
+
+- **Audits**: Schedule quarterly security reviews.
+
+## ADR Process
+
+- All major architecture choices → log in `doc/adr/`.
+
+- Use ADR template with Context, Decision, Consequences, Status.
+
+- Link related ADRs in PR descriptions.
+
+> 🔗 **Human Hook:** When proposing a new ADR, schedule a 30-min
+> design sync for discussion, not just async review.
+
+## Collaboration Hooks
+
+- **QR features**: Sync with Security before merging → permissions &
+
+  privacy.
+
+- **New platform builds**: Demo in team meeting → confirm UX
+
+  differences.
+
+- **Critical ADRs**: Present in guild or architecture review.
+
+## Testing Implementation
+
+- **Unit tests** for services.
+
+- **Playwright** for Web + Capacitor:
+
+  - `playwright.config-local.ts` includes web + Pixel 5.
+
+- **Electron tests**: add `spectron` or Playwright-Electron.
+
+- Mark tests with platform tags:
+
+  ```ts
+
+  test.skip(!process.env.MOBILE_TEST, "Mobile-only test");
+
+  ```
+
+> 🔗 **Human Hook:** Before merging new tests, hold a short sync (≤15
+> min) with QA to align on coverage and flaky test risks.
+
+## Self-Check
+
+- [ ] Does this feature implement a shared interface?
+
+- [ ] Are fallbacks + errors handled gracefully?
+
+- [ ] Have relevant ADRs been updated/linked?
+
+- [ ] Did I add competence hooks or prompts for the team?
+
+- [ ] Was human interaction (sync/review/demo) scheduled?
+
+---
+
+**See also**:
+
+- `.cursor/rules/app/architectural_decision_record.mdc` for
+
+  core architecture principles
+
+- `.cursor/rules/app/architectural_patterns.mdc` for architectural patterns and
+
+  examples
+
+**Status**: Active implementation guidelines
+**Priority**: High
+**Estimated Effort**: Ongoing reference
+**Dependencies**: architectural_decision_record.mdc
+**Stakeholders**: Development team, Architecture team
+
+## Model Implementation Checklist
+
+### Before Architectural Implementation
+
+- [ ] **Interface Review**: Verify feature implements shared interface
+- [ ] **ADR Review**: Check if ADR is required for major changes
+- [ ] **Security Assessment**: Assess security implications for QR features
+- [ ] **Platform Planning**: Plan platform-specific implementation details
+
+### During Architectural Implementation
+
+- [ ] **Interface Implementation**: Implement shared interfaces consistently
+- [ ] **Error Handling**: Implement graceful fallbacks and error handling
+- [ ] **Testing Strategy**: Plan unit tests for services and E2E tests
+- [ ] **Human Interaction**: Schedule syncs/reviews/demos as needed
+
+### After Architectural Implementation
+
+- [ ] **Interface Validation**: Verify shared interfaces are properly implemented
+- [ ] **Testing Execution**: Run unit tests and platform-specific tests
+- [ ] **ADR Updates**: Update relevant ADRs and link in PR descriptions
+- [ ] **Team Communication**: Share implementation results with team