feat(facets): all-facets panel with under-filter counts (faceted plan Phase 7)

The 9 Batch A facets could not be SET from the web UI, the facets
endpoint had no in-app consumer, and the registry's libraryTypes hints
rendered nowhere. This phase closes all three.

- ONE UNION-ALL sqlc query (FacetCountsUnderFilters) computes all 14
  listable facets in a single round trip: each arm omits its OWN
  facet's filter block and carries every other registered facet's
  block (copied mechanically from SearchMediaItemsUnified) — classic
  faceted semantics: with filters active each facet counts under the
  others; with none, blocks are neutral and the counts are the v1
  global-per-library ones. One query serves both cases. The 14
  per-column Batch C queries are deleted.
- Endpoint: no facet param → the new all-facets shape
  ({facets: {param: [{value, display?, count}]}}), filters bound via
  the shared ParseMediaSearchParams, library_id optional (the
  All-Libraries view, family lens still enforced); facet=X keeps the
  pinned single-facet shape (now routed through the same query with
  neutral filters).
- SSR partial GET /media-items/facet-panel: templ renders the drawer's
  value lists — registry order, Batch D library-type scoping
  (FacetsForLibraryType: manga_type on manga, reading_direction on
  manga+comics, narrator on audiobooks; All view = union), prettified
  genre labels + language display names, active values marked. Family
  lens: out-of-set explicit library_id is 403.
- Drawer wiring: the panel fetches on drawer open and after every
  apply with the CURRENT filter query string; a value click toggles
  that facet's comma-joined filter (hidden input where the drawer has
  no field — same as deep links) and re-applies the form; chips and
  URL stay in sync. Values are server-rendered (rendering doctrine);
  bookshelf.ts owns only the click/fetch orchestration.
- prettifyGenre moves to internal/utils as the canonical
  implementation (services' display enrichment shares it; templ wraps
  it; the TS port in bookshelf.ts is unchanged).
- Drift guard extended: FacetCountsUnderFiltersParams must carry every
  registry facet's param, the bools as pgtype.Bool.

Tests: under-filter exactness (own-block omission, OR-within,
AND-across), family lens (hidden values absent; 403 on both shapes),
all-shape + pinned-shape coexistence, partial rendering with Batch D
scoping + active marking + 403. Full container suite green except the
documented pre-existing TestAdminCreateUser red.

templates/utils.go

@@ -3,13 +3,13 @@ package templates
 import (
 	"bookhoard/internal/database"
 	"bookhoard/internal/handlers"
+	"bookhoard/internal/utils"
 	"encoding/json"
 	"fmt"
 	"strconv"
 	"net/url"
 	"sort"
 	"strings"
-	"unicode"
 	"time"
 
 	"github.com/google/uuid"
@@ -256,39 +256,12 @@ func conflictID(c *handlers.ConflictDetailResponse) string {
 	return c.ID
 }
 
-// genreSmallWords stay lowercase in title-case rendering (except the
-// first word of the value).
-var genreSmallWords = map[string]bool{
-	"a": true, "an": true, "and": true, "of": true, "the": true,
-	"in": true, "on": true, "for": true, "to": true, "or": true,
-}
-
 // prettifyGenre renders the canonically-lowercase genre value in title
-// case at display time (Batch B transform — never in the DB). Only
-// values that are ENTIRELY lowercase get transformed; anything else is
-// returned verbatim, protecting user-entered mixed case. Small words
-// stay down except in the first position; "&" has no case and passes
-// through. "science fiction" → "Science Fiction", "sword & sorcery" →
-// "Sword & Sorcery".
+// case at display time — the canonical implementation lives in
+// internal/utils (services' facet panel shares it); this wrapper keeps
+// the templ call sites short.
 func prettifyGenre(value string) string {
-	trimmed := strings.TrimSpace(value)
-	if trimmed == "" {
-		return ""
-	}
-	if trimmed != strings.ToLower(trimmed) {
-		return trimmed // mixed case = user-authored; display as written
-	}
-	words := strings.Fields(trimmed)
-	out := make([]string, len(words))
-	for i, w := range words {
-		if i > 0 && genreSmallWords[w] {
-			out[i] = w
-			continue
-		}
-		runes := []rune(w)
-		out[i] = string(append([]rune{unicode.ToUpper(runes[0])}, runes[1:]...))
-	}
-	return strings.Join(out, " ")
+	return utils.PrettifyGenre(value)
 }
 
 // getAlternateSeries extracts the alternate series name from JSONB data