fix(ext/popup): replace inline ⤴ vault-tab button with GLYPH_VAULT_TAB

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

@@ -3,6 +3,7 @@
 /// to the detail view.
 
 import { getState, setState, sendMessage, navigate, escapeHtml, openVaultTab } from '../../shared/state';
+import { GLYPH_VAULT_TAB } from '../../shared/glyphs';
 import type { ItemId, ItemType, ManifestEntry, Item } from '../../shared/types';
 
 /// Extract the display hostname from an icon_hint or fallback to the first tag.
@@ -66,7 +67,7 @@ export function renderItemList(app: HTMLElement): void {
       <button class="btn" id="new-btn" style="font-size:11px;">+ new</button>
       <button class="btn" id="sync-btn" style="font-size:11px;">sync</button>
       <span style="flex:1;"></span>
-      <button class="btn" id="vault-btn" style="font-size:11px;" title="Open vault (Shift+F)">&#x2934;</button>
+      <button class="btn" id="vault-btn" style="font-size:11px;" title="Open vault (Shift+F)">${GLYPH_VAULT_TAB}</button>
       <button class="btn" id="settings-btn" style="font-size:11px;">settings</button>
       <button class="btn" id="lock-btn" style="font-size:11px;">lock</button>
     </div>