## Why

Umami click tracking is currently limited to `target_id`/`placement`, which makes it harder to understand *which* specific content items (by title/type) users engage with most. Adding lightweight content metadata to click events enables clearer measurement and reporting.

## What Changes

- Extend Umami click event instrumentation so content-related links include additional event data:
  - `data-umami-event-title`: the content title (e.g., post/video/episode/page title)
  - `data-umami-event-type`: the content type (e.g., `blog_post`, `blog_page`, `video`, `podcast_episode`)
- Apply the above consistently across all instrumented content links (cards, lists, navigation items that represent a specific piece of content).
- Ensure the metadata is additive and does not replace the existing deterministic identifiers:
  - keep `data-umami-event-target_id`
  - keep `data-umami-event-placement`
  - keep `data-umami-event-target_url` for links

## Capabilities

### New Capabilities
- (none)

### Modified Capabilities
- `interaction-tracking-taxonomy`: add/standardize optional content metadata fields (`title`, `type`) for tracked click events, and define allowed values for `type`.
- `analytics-umami`: require Umami Track Events data-attribute instrumentation to support the above additional `data-umami-event-*` properties on content-related clickables.

## Impact

- Affected code: shared link/card components and content listing/detail pages (videos, podcast, blog posts/pages, and any other instrumented content surfaces).
- Data: Umami event payloads will include two additional string fields for content links; dashboards/reports can segment by `type` and view top-clicked items by `title`.
