feat: rich command templates with public links + media text-first flow

- Command templates now match notification template style: type icons,
  linked filenames via album shared links, location, favorite status
- Media mode sends text message first, then media as reply (was media-only)
- Search/find/person/place resolve asset public URLs from tracked albums'
  shared links (share/{key}/photos/{id})
- Albums/summary commands include album public_url in context
- Enriched command template preview sample context with public_url, city,
  country, is_favorite
- Extract sanitizePreview to shared lib/sanitize.ts
- Command template preview now renders HTML links (was raw text)
- Global provider filter moved above search in sidebar
- CLAUDE.md: template consistency + context variable sync rules

CLAUDE.md

@@ -35,4 +35,11 @@ Detailed context is split into focused documents under `.claude/docs/`. Read the
    - Feature gating: check `capabilities.notification_slots` or `capabilities.commands`, not `provider.type === 'immich'`
    - Template variable helpers: ALL provider types must have entries in `get_template_variables()`
 9. **Nav tree & entity types** — when adding a new entity type (target type, bot type, etc.), update the sidebar nav in `frontend/src/routes/+layout.svelte`. Target types need: `{ href: '/targets?type={type}', key: 'nav.target{PascalName}', icon: '...', countKey: 'targets_{type}' }` in the `children` array under `nav.targets`, plus i18n keys `nav.target{PascalName}` in both locale files. Also add the counter entry `targets_{type}: targets.filter(t => t.type === '{type}').length` to the `counts` derived block in `+layout.svelte`.
-10. **New provider descriptor checklist** — when adding a new service provider, create a descriptor file in `frontend/src/lib/providers/{name}.ts` and register it in `index.ts`. The descriptor must define: `type`, `defaultName`, `icon`, `hasUrl`, `configFields`, `buildConfig()`, `hasConfigChanged()`, `eventFields`, `collectionMeta` (or `null`). Optional: `extraTrackingFields`, `featureSections`, `webhookUrlPattern`, `webhookBased`, `onBeforeSave`. Also add i18n keys: `providers.type{PascalName}` and `gridDesc.provider{PascalName}` in both `en.json` and `ru.json`.
+10. **Template consistency** (IMPORTANT) — notification templates and command templates for the same provider MUST use the same formatting patterns. If notification templates wrap URLs in `<a href>`, show type icons, location, and favorite status for assets, command templates must do the same. The reference pattern is the `assets_added` notification template. Command handlers must pass rich asset dicts (`public_url`, `city`, `country`, `is_favorite`, `type`) to templates — not just `id` and `originalFileName`.
+11. **New provider descriptor checklist** — when adding a new service provider, create a descriptor file in `frontend/src/lib/providers/{name}.ts` and register it in `index.ts`. The descriptor must define: `type`, `defaultName`, `icon`, `hasUrl`, `configFields`, `buildConfig()`, `hasConfigChanged()`, `eventFields`, `collectionMeta` (or `null`). Optional: `extraTrackingFields`, `featureSections`, `webhookUrlPattern`, `webhookBased`, `onBeforeSave`. Also add i18n keys: `providers.type{PascalName}` and `gridDesc.provider{PascalName}` in both `en.json` and `ru.json`.
+12. **Template context variables** (IMPORTANT) — when adding new variables to templates, update ALL of these in sync:
+    - Runtime context builder: `packages/core/src/notify_bridge_core/templates/context.py`
+    - Variable docs: `packages/server/src/notify_bridge_server/api/template_configs.py` (`get_template_variables()`)
+    - Notification preview sample: `packages/server/src/notify_bridge_server/services/sample_context.py` (`_SAMPLE_CONTEXT`)
+    - Command preview sample: `packages/server/src/notify_bridge_server/api/command_template_configs.py` (`sample_ctx` in `preview_raw`)
+    - Runtime validator whitelist: `packages/core/src/notify_bridge_core/templates/validator.py`