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

[andykais-claude]

Summary

This is a rebase of #68 (cursor/series-view-page-1fd2) onto the current main, plus the follow-up changes needed to keep the new /series/<id> route consistent with commits that landed on main since the original PR branched.

Adds a new /series/<series_id> page to @forager/web for viewing the contents of a media series. The 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.

Rebase notes

• Rebased the original commit (extract shared browse-like components into $lib/components) onto main.
• main gained impl(core,cli,web): add media_type search filter (#71), which added a media_type filter (image/video/audio) to both media and series search. The new series route created its own queryparams.svelte.ts before that feature existed, so a follow-up commit brings the series query params in line with browse: the image/video/audio dropdown values now map to the canonical uppercase query.media_type filter supported by forager.series.search (in addition to the legacy animated value).
• main also gained impl(web): ToggleFullScreen and ToggleFitMedia keybinds (#60), which modified Footer.svelte, MediaView.svelte, and browse/+page.svelte — files this PR moved/renamed into $lib/components/browse_like/. Git detected the renames and merged impl(web): ToggleFullScreen and ToggleFitMedia keybinds #60 into the new locations with a few content conflicts, resolved as follows:
  • MediaView.svelte: kept impl(web): ToggleFullScreen and ToggleFitMedia keybinds #60's new is_fullscreen/refresh_fullscreen_state/media_fit_classes state, the fullscreen-aware Escape handler, and the ToggleFitMedia / ToggleFullScreen keybinds; only overlaid this PR's BrowseLikeController type so the component is shared across routes.
  • Footer.svelte: kept impl(web): ToggleFullScreen and ToggleFitMedia keybinds #60's new "view:" fit-mode toggle button, "tiles:" label, and grid change; overlaid the BrowseLikeController type.
  • browse/+page.svelte: kept impl(web): ToggleFullScreen and ToggleFitMedia keybinds #60's on:keydown|capture handler.
  • Applied the same on:keydown|capture change to series/[series_id]/+page.svelte so the new keybinds work identically on the series route (which shares MediaView).

Differences from /browse

• Each media tile displays its series_index underneath (#0, #1, …).
• 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 renders a View series link that navigates to /series/<id>.

Shared components

• Moved Footer, SearchParams, SearchResults, MediaList, MediaView, MediaDetails, MediaDetailEntry, and SearchLink into $lib/components/browse_like/.
• Moved dimensions and media_selections runes into $lib/runes/.
• Introduced a BrowseLikeController base with a BrowseLikeQueryParams contract so both routes drive the shared components uniformly.
• Widened MediaListRune to accept a 'series_search' paginate input backed by forager.series.search.

Testing

• deno task --cwd packages/web build — succeeds.
• deno run -A npm:svelte-check — 125 errors (down from 133 pre-rebase thanks to impl(web): ToggleFullScreen and ToggleFitMedia keybinds #60's settings typing); all pre-existing module-resolution/indexing errors. No new errors introduced by the rebase or conflict resolution (resolved MediaView.svelte is byte-identical to main's except the shared-controller type import).
• Manually verified end-to-end in a browser on /series/4 (a seeded 3-item series of image/video/audio):
  • The page renders all items with #0/#1/#2 labels.
  • The image/video/audio media_type filter dropdown filters correctly.
  • impl(web): ToggleFullScreen and ToggleFitMedia keybinds #60's new keybinds now work on the series route: f toggles fullscreen and Ctrl+Space toggles media fit (the media visibly resizes), matching /browse.