fix(workspace): hidden bullet actions on phones, no second extract, notice layout

- The floating bullet actions only react to hover on devices with a real
  pointer; a tap on a phone made the invisible buttons clickable.
- A bullet that is only a note link (plus hashtags) can no longer be
  extracted: button and /extract are hidden, the server answers 400.
- Extract notice on phones sits above the bottom navigation, text on
  top (two lines max) with the actions below.
- Release v0.26.1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/lib/wikiLink.ts

@@ -31,3 +31,8 @@ export function buildBlockLink(title: string, blockId: string, blockContent: str
   const label = excerpt ? `${clean(title)} › ${excerpt}` : clean(title);
   return `[[${clean(title)}#^${blockId}|${label}]]`;
 }
+
+/** A bullet that is only a link to a note (plus hashtags), as left behind when a branch became a note. */
+export function isNoteLinkOnly(content: string): boolean {
+  return /^\s*\[\[[^\]]+\]\](\s+#[\p{L}\p{N}_-]+)*\s*$/u.test(content);
+}