feat(ext/popup): wire attachments disclosure into 6 type forms + 📎 list indicator

Each existing type form (Login, SecureNote, Identity, Card, Key, TOTP)
renders + wires the attachments-disclosure in both edit and view modes.
Form save reads from attachmentsDraft; teardown revokes any image
object URLs. Item-list rows show a 📎 glyph for items with at least
one attachment.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

extension/src/popup/components/item-list.ts

@@ -32,7 +32,7 @@ export function renderItemList(app: HTMLElement): void {
   const rowsHtml = filtered.length > 0
     ? filtered.map(([id, e], i) => `
         <div class="entry-row ${i === state.selectedIndex ? 'selected' : ''}" data-id="${escapeHtml(id)}" data-index="${i}">
-          <span class="entry-name"><span class="type-icon" aria-hidden="true">${typeIcon(e.type)}</span> ${escapeHtml(e.title)}</span>
+          <span class="entry-name"><span class="type-icon" aria-hidden="true">${typeIcon(e.type)}</span> ${escapeHtml(e.title)}${e.attachment_summaries.length > 0 ? ' <span class="entry-row__attach-indicator" title="has attachments">📎</span>' : ''}</span>
           <span class="entry-meta">${escapeHtml(metaLine(e))}</span>
         </div>
       `).join('')