feat(web): note editing at the reader slider and book banner; Deleted rename

Objective 8a (web half). Reader notes-drawer rows gain an inline editor
(mirroring the bookmark-rename pattern) that PUTs the new content — the
stored position rides along because the server's note PUT hard-sets the
position column (a probe note proved an omitted position NULLs the
anchor). Book-detail banner rows gain Edit/Delete for location notes
and Edit-note/Add-note for the note ATTACHED to a highlight (full-replace
highlight PUT; empty content clears the note; the highlight itself is
never edited from the banner). The edit dialog is centered with the
markdown caption.

The book-detail 'Notes' button becomes 'Deleted' (badge =
deleted-annotation count) and the modal title becomes 'Deleted
annotations' — that modal only ever showed removed annotations.

Verified live in Brave: drawer inline edit round-trips content and
position; banner note edit, highlight-note edit, and delete (tombstone
appears in the Deleted modal); rename renders with the count badge.

web/src/annotations-banner.ts

@@ -25,6 +25,9 @@ interface AnnotationRow {
   loc: string;
   /** row accent color (swatch) */
   color: string;
+  /** highlight rows: whether a note rides on the highlight (Edit-note vs
+   *  Add-note label). Note rows always true. */
+  hasNote: boolean;
   expanded: boolean;
 }
 
@@ -96,6 +99,7 @@ function buildAnnotationRows(
       rich: renderNoteHtml(content),
       loc,
       color: "var(--accent)",
+      hasNote: true,
       expanded: false,
     };
     rows.push(row);
@@ -144,6 +148,7 @@ function buildAnnotationRows(
       rich,
       loc,
       color,
+      hasNote: !!note,
       expanded: false,
     };
     rows.push(row);