feat: Add Storybook configuration and motion tokens implementation

- Introduced Storybook configuration files (`main.ts`, `preview.ts`, `tsconfig.json`) for Angular components.
- Created motion tokens in `motion-tokens.ts` to define durations, easing functions, and transforms.
- Developed a Storybook story for motion tokens showcasing their usage and reduced motion fallback.
- Added SCSS variables for motion durations, easing, and transforms in `_motion.scss`.
- Implemented accessibility smoke tests using Playwright and Axe for automated accessibility checks.
- Created portable and sealed bundle structures with corresponding JSON files for evidence locker.
- Added shell script for verifying notify kit determinism.

docs/notifications/operations/retries.md

@@ -0,0 +1,7 @@
+# Retry and idempotency policy (NR5)
+
+- `delivery_id`: UUIDv7; `dedupe_key`: hash(event_id + rule_id + channel_id).
+- Backoff: exponential with jitter; base 2s, factor 2, max 5 attempts, cap 5 minutes between attempts.
+- Connectors must be idempotent; retries reuse the same `dedupe_key` and must not duplicate sends.
+- Out-of-order acks ignored: only monotonic `attempt` accepted.
+- Record retry outcomes in receipts and include attempt count + reason.