impl(web): add /series/<id> page for viewing a media series

[andykais-claude]

Summary

Adds a new /series/<series_id> page to @forager/web for viewing the contents of a media series. The new page mirrors the /browse layout (Header with filters, Sidebar with details, Footer with view controls, MediaList/MediaView in the main area) but drives its results from forager.series.search scoped to the given series_id.

Differences from /browse

• Each media tile displays its series_index underneath (#0, #1, …) so you can see what "page" of the series it corresponds to.
• The sort dropdown defaults to Series Index and includes series_index alongside the standard sort options. The group_by-only Count option is excluded.
• Default order is ascending.
• The search mode / group-by controls are omitted since they don't apply inside a series.

Cross-linking from /browse

Every media-series tile on /browse now renders a View series link under the tile that navigates to /series/<id>.

Shared components

Per the task requirements, components are shared rather than imported across routes:

• Moved Footer, SearchParams, SearchResults, MediaList, MediaView, MediaDetails, MediaDetailEntry, and SearchLink from routes/browse/components/ into $lib/components/browse_like/.
• Moved dimensions and media_selections runes from routes/browse/runes/ into $lib/runes/.
• Introduced a BrowseLikeController base class in $lib/base_controller.ts with a BrowseLikeQueryParams contract so both routes can drive the shared components uniformly.
• SearchParams accepts sort_options and extra_filters snippets so each route can contribute its own sort options and route-specific filter controls without importing across routes.
• SearchResults / MediaList accept show_series_index and show_series_link props to toggle the per-tile labels.
• Widened MediaListRune to accept a new 'series_search' paginate input backed by forager.series.search.

Walkthrough

series_view_walkthrough.mp4

Walkthrough of /browse → click View series → arrive at /series/6 with #0/#1/#2 labels → open the sort dropdown showing Series Index → click a tile to open the details sidebar → return to /browse.

Browse page showing the new View series links

Browse page with the new "View series" links underneath each media-series tile.

Series page showing #0, #1, #2 series_index labels

Series detail page showing #0, #1, #2 labels under each tile.

Sort dropdown with Series Index as the default option

Sort dropdown with Series Index as the default option (and no Count option).

Sidebar details for a selected series tile

Sidebar details appear as on /browse when a tile is clicked.

Testing

• Built the web package with deno task --cwd packages/web build (succeeds).
• Seeded a local forager DB with a few media files and two series (/series/6 = "Cat Series" with 3 items, /series/7 = "Mixed Series" with 2 items).
• Ran deno task --cwd packages/cli develop --config=... gui and manually walked through /browse → /series/6 in Chrome, verifying: the View series link navigates correctly, series tiles display with their series_index, the sort dropdown shows Series Index as the default and re-orders correctly on change, the sidebar opens with details when a tile is clicked, and the browser back/forward continues to work. See the walkthrough video and screenshots above.
• Ran deno run -A npm:svelte-check. My change results in fewer type errors than main (133 vs. 190) because consolidating the duplicated code removed a number of small pre-existing mismatches; no new errors are introduced by this PR.

Notes

• No existing routes import components from another route — the split is strictly routes/* → $lib/*.
• The pre-existing hard-to-see filter toggle icon is out of scope for this PR.

_{To show artifacts inline, enable in settings.}