feat(search): viewer progress + completed badges; dropdown to templ

Search results now show where you are in a book: a completed check at
the 0.999 threshold (same cut as the filter status arms), a partial
progress bar along the cover while mid-read, nothing when you never
opened it. Rendered in BookCard (any grid whose adapter loads viewer
progress) and in the header-search dropdown rows.

The progress rides a LEFT JOIN reading_progress on the SAME user_id
param SearchMediaItemsUnified already binds for library visibility —
one requester param, no new wire inputs, row-neutral join (the table
is UNIQUE per media_item+user). SearchMediaItemsUnifiedRow and BookInfo
gain the keys additively (viewer_percentage null when unknown,
library_name empty on feeds that don't load it); contract_pins.md
carries the changelog entry and the pin tests widen in lockstep.

The header dropdown itself migrates off the innerHTML string renderer
in search.ts (a rendering-ownership violation: a templ twin existed via
the HX-Request branch). The input now hx-gets layout=dropdown and swaps
the new templ SearchResults partial — titles/authors highlighted
server-side (escape-first, safe by construction), rows with the same
progress overlays — while a slim Alpine component owns only
client-local state (min-length gating, open/close, keyboard selection,
htmx lifecycle). web/src/rendering-allowlist.txt drops the search.ts
baseline to zero accordingly.

Integration test pins the per-user join (fresh user sees 1.0/0.42/null
on the fixture; the shared admin sees null everywhere — read-only) and
the dropdown partial's overlays/count/row count.

internal/handlers/cards.go

@@ -13,7 +13,7 @@ import (
 // BookInfo is THE canonical wire+template card shape: every surface that
 // lists a book card as JSON (collections detail, series, preview,
 // dashboard sections, search) or renders a templ card (BookCard in
-// dashboard.templ, BooksGrid, BrowseDetail) carries exactly these seven
+// dashboard.templ, BooksGrid, BrowseDetail) carries exactly these nine
 // keys and no others — pinned by docs/contract_pins.md.
 //
 // H2 doctrine: this struct is constructed in EXACTLY ONE place —
@@ -34,6 +34,15 @@ type BookInfo struct {
 	// comic vs manga rides the LIBRARY type (format_group only knows
 	// comic_archive — manga_type is unreliable across sources).
 	Badge string `json:"badge"`
+	// Viewer-scoped extras (2026-10-27 search-progress batch): nil
+	// percentage = the requesting user never opened the book, so cards
+	// render no progress bar and no completed badge. Adapters that
+	// don't load viewer progress leave it nil; the search-unified
+	// adapter is the only populated feed today. LibraryName rides the
+	// same deal (unified rows carry it as a column; other feeds leave
+	// it empty rather than pay a join).
+	ViewerPercentage *float64 `json:"viewer_percentage"`
+	LibraryName      string   `json:"library_name"`
 }
 
 // LibraryTypeMap builds libraryID→library-type-name for badge resolution
@@ -79,12 +88,14 @@ func MediaBadgeKind(formatGroup, libraryTypeName string) string {
 // adapters below normalize the sqlc row shapes into cardSource.
 func buildBookCard(src cardSource) BookInfo {
 	return BookInfo{
-		MediaItemID:    src.ID.String(),
-		Title:          src.Title,
-		Author:         src.Author,
-		CoverImagePath: utils.ResolveMediaURL(src.LibraryID, src.CoverPath),
-		FormatGroup:    src.FormatGroup,
-		Badge:          MediaBadgeKind(src.FormatGroup, src.LibraryType),
+		MediaItemID:      src.ID.String(),
+		Title:            src.Title,
+		Author:           src.Author,
+		CoverImagePath:   utils.ResolveMediaURL(src.LibraryID, src.CoverPath),
+		FormatGroup:      src.FormatGroup,
+		Badge:            MediaBadgeKind(src.FormatGroup, src.LibraryType),
+		ViewerPercentage: src.ViewerProgress,
+		LibraryName:      src.LibraryName,
 	}
 }
 
@@ -102,6 +113,10 @@ type cardSource struct {
 	CoverPath   pgtype.Text
 	FormatGroup string
 	LibraryType string
+	// Viewer-scoped extras: nil progress = no data loaded for the
+	// requesting user (see BookInfo.ViewerPercentage).
+	ViewerProgress *float64
+	LibraryName    string
 }
 
 // BookCardsFromMediaItems builds cards from full media rows
@@ -167,18 +182,27 @@ func BookCardsFromCollectionItemRows(rows []database.GetCollectionItemsRow, libT
 
 // BookCardsFromUnified builds cards from search-unified rows. Those
 // rows carry the library type name as a SQL column, so this adapter
-// needs no LibraryTypeMap query at all.
+// needs no LibraryTypeMap query at all — and the viewer's own
+// progress (the 2026-10-27 search-progress batch), which no other
+// feed loads.
 func BookCardsFromUnified(rows []database.SearchMediaItemsUnifiedRow) []BookInfo {
 	cards := make([]BookInfo, 0, len(rows))
 	for _, r := range rows {
+		var viewer *float64
+		if r.ViewerPercentage.Valid {
+			pct := r.ViewerPercentage.Float64
+			viewer = &pct
+		}
 		cards = append(cards, buildBookCard(cardSource{
-			ID:          uuid.UUID(r.ID.Bytes),
-			Title:       r.Title,
-			Author:      utils.PgTextString(r.Author),
-			LibraryID:   r.LibraryID,
-			CoverPath:   r.CoverImagePath,
-			FormatGroup: r.FormatGroup,
-			LibraryType: r.LibraryTypeName,
+			ID:             uuid.UUID(r.ID.Bytes),
+			Title:          r.Title,
+			Author:         utils.PgTextString(r.Author),
+			LibraryID:      r.LibraryID,
+			CoverPath:      r.CoverImagePath,
+			FormatGroup:    r.FormatGroup,
+			LibraryType:    r.LibraryTypeName,
+			ViewerProgress: viewer,
+			LibraryName:    r.LibraryName,
 		}))
 	}
 	return cards