feat: Add GlowTrack mood and habit wellbeing grid specifications

- Introduced export schema for JSON data structure.
- Created renderer contract detailing canvas/SVG rendering requirements.
- Defined IndexedDB storage schema and migration strategies.
- Documented data model including entities and relationships.
- Developed implementation plan outlining execution flow and project structure.
- Provided quickstart guide for development environment setup.
- Compiled research documentation on performance, accessibility, and theming.
- Established feature specification with user scenarios and functional requirements.

specs/001-glowtrack-a-mood/research/04-pwa-sw-offline-safety.md

@@ -0,0 +1,19 @@
+# Research: PWA SW Updates & Offline Write Safety
+
+## Hypothesis
+With cache versioning and cautious update prompts, we can avoid data loss during app updates and schema bumps while offline.
+
+## Questions
+- Best timing for SW activation without disrupting writes
+- Handling schema migrations when a stale SW is cached
+- Safe rollback strategy
+
+## Method
+- Simulate offline state; bump schema; observe SW activation and data integrity
+
+## Acceptance
+- No data loss or corruption across update/migration
+- Clear UX for update available and post-update state
+
+## Deliverables
+- SW update policy, cache naming, migration/rollback checklist