feat(search): unified library search across books, series, authors, narrators

[kevinheneveld]

What this adds

Unified library search — searching what you already own, not the outward-facing "Add new" metadata search.

• The header search now matches across four dimensions at once — Books / Series / Authors / Narrators — grouping suggestions by kind. Each suggestion links where you'd expect: books to the detail page, the rest to their collection page.
• Enter (or a new "See all results" row) opens a dedicated results page at /search (LibrarySearchView) listing every match in sectioned groups.
• Matching logic lives in utils/librarySearch, shared by the overlay and the page and keyed off a shared normalizer so a suggestion's count always matches the page it links to. Entirely client-side over the loaded library, with the distinct-name index memoized so typing stays responsive. Non-person narrator credits ("Full Cast", "Various", uncredited) are excluded so the library doesn't sprout pseudo-pages.

It also repairs a currently-dangling navigation: the header already did router.push({ name: 'search' }), but no route named search exists on the current tree (content/SearchView.vue is orphaned), so that push silently failed. This PR makes it resolve.

This is coordinated with in-flight work — not a blind feature drop

I checked this against the open FE PRs before opening it. Calling out the overlaps explicitly so review is easy:

• fix: normalise author group keys to prevent duplicate author cards (#672) #673 (author group-key normalization, @s3ntin3l8) — heads up: fix: normalise author group keys to prevent duplicate author cards (#672) #673 and this PR independently introduce an identical normalizeCollectionText in fe/src/utils/textUtils.ts (byte-for-byte the same NFKD→strip-diacritics→lowercase→collapse helper). That's a duplicate-export collision if both land as-is. I'd suggest landing one of them and having the other consume it — I'm happy to drop mine and rebase onto fix: normalise author group keys to prevent duplicate author cards (#672) #673's, or vice-versa, whatever's easier for the maintainers. This PR adds one more helper alongside it (isNonPersonNarrator) which is search-specific.
• feat(library): clickable list-view column headers for sorting (#625) #674 / fix(library): stabilize list-view virtual scroller (#675) #676 (list-view sort headers + virtual-scroller, @s3ntin3l8) — both churn fe/src/views/library/AudiobooksView.vue. This PR deliberately does not touch that file. Browse-by-narrator (which does touch it) is intentionally split into a separate follow-up so it doesn't collide with feat(library): clickable list-view column headers for sorting (#625) #674/fix(library): stabilize list-view virtual scroller (#675) #676; I'd rather land those first.
• Stabilize dependency restores and frontend build validation #679 (dependency/build stabilization, @therobbiedavis) — extracts services/routerInstance.ts out of router/index.ts. This PR's only router change is a single additive route block, so it rebases onto that refactor trivially. Happy to sequence after Stabilize dependency restores and frontend build validation #679 lands.
• Backend architecture priorities: stabilize tests, boundaries, and runtime workflows #677 / Frontend architecture priorities: separate auth state, router redirects, and tests #678 (architecture priorities) — aware of the direction toward separating auth state and router redirects. This change is additive and route-local; it doesn't move auth or guard logic, so it shouldn't cut across that work.

On timing

I know the current iteration is scoped to critical bugs and reviewer bandwidth is tight, so no rush expected on my end. The reason I'm raising it now rather than sitting on it: the router (#679) and the architecture issues (#677/#678) are about to reshape the files this touches, and #673 is already duplicating the normalizer — so coordinating now is cheaper than rebasing a stale branch later. Totally fine to park this until the next iteration opens up; I mainly want the overlap visible so nobody rebuilds it.

Testing

• vue-tsc type-check: clean.
• Full FE unit suite: 387 passed, 1 skipped (unchanged from base).
• 9 new tests for librarySearch (book/series/author/narrator matching, normalization, non-person-narrator exclusion, counts).

Files

File	Change
fe/src/utils/librarySearch.ts	new — shared matching/faceting
fe/src/views/library/LibrarySearchView.vue	new — /search results page
fe/src/__tests__/librarySearch.spec.ts	new — unit tests
fe/src/utils/textUtils.ts	+normalizeCollectionText (see #673 note), +isNonPersonNarrator
fe/src/router/index.ts	+/search route
fe/src/App.vue	header overlay: grouped suggestions + "See all results"