feat(search): group results into book cards with stable scrollbars

Group search results by book into one deduplicated card per book: the top hit
shown prominently, locations in a leading reference column, matched terms in
gold, and the remaining hits in a fixed-height, scrollable list. Reuse the book
pane's ContentAwareScrollbarShell so the expanded list and the main results list
both get a themed, stable scrollbar thumb (sized from the facet book count, so it
no longer shrinks as more pages load).

- ViewModel: expose bookFacetCountsFlow and loadAllHitsForBook(bookId)
- TabsContent: wire book counts and the per-book hit loader into the shell
- strings: add search_more_in_book / search_collapse

Signed-off-by: Elie Gambache <elyahou.hadass@gmail.com>

Author: kdroidFilter

SeforimApp/src/commonMain/composeResources/values/strings.xml

@@ -484,6 +484,8 @@
     <string name="search_load_more">טען תוצאות נוספות</string>
     <string name="search_result_count">נמצאו %1$d/%2$d תוצאות</string>
     <string name="search_result_count_complete">נמצאו %1$d תוצאות</string>
+    <string name="search_more_in_book">עוד %1$d תוצאות בספר זה</string>
+    <string name="search_collapse">הסתר</string>
     <string name="search_stop">בטל חיפוש</string>
     <string name="search_near_selector_label">קרבה</string>
     <string name="search_extended_label">חיפוש מורחב (כל הספרים)</string>

SeforimApp/src/jvmMain/kotlin/io/github/kdroidfilter/seforimapp/core/presentation/tabs/TabsContent.kt

@@ -362,6 +362,7 @@ private fun SearchTabContent(
     val selectedTocIds by viewModel.selectedTocIdsFlow.collectAsState()
     val tocCounts by viewModel.tocCountsFlow.collectAsState()
     val tocTree by viewModel.tocTreeFlow.collectAsState()
+    val bookCounts by viewModel.bookFacetCountsFlow.collectAsState()
 
     val actions =
         remember(viewModel) {
@@ -422,6 +423,8 @@ private fun SearchTabContent(
         selectedTocIds = selectedTocIds,
         tocCounts = tocCounts,
         tocTree = tocTree,
+        bookCounts = bookCounts,
+        loadBookHits = viewModel::loadAllHitsForBook,
         actions = actions,
     )
 }