fix(web): banner highlight delete; retention wording states the days

The book-detail banner's highlight rows gain Delete (tombstoned
server-side, restorable from the Deleted modal — same as the reader
drawers already offered). The deleted-annotations modal now says the
retention in plain language — 'kept for 30 days' from the
annotation_tombstone_ttl_days tunable (threaded through BookDetail →
NotesHighlightsModal; 1-day singular and retention-disabled variants
handled) — instead of referencing a settings name a reader cannot see.

templates/book_detail_templ.go

@@ -17,7 +17,7 @@ import (
 	"strings"
 )
 
-func BookDetail(user User, book handlers.MediaDetail, errorMessage string) templ.Component {
+func BookDetail(user User, book handlers.MediaDetail, errorMessage string, tombstoneDays int) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -1396,7 +1396,7 @@ func BookDetail(user User, book handlers.MediaDetail, errorMessage string) templ
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = NotesHighlightsModal(user, book).Render(ctx, templ_7745c5c3_Buffer)
+		templ_7745c5c3_Err = NotesHighlightsModal(user, book, tombstoneDays).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}