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/__tests__/wikiLink.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { buildBlockLink, parseWikiLink, wikiLinkText } from '../wikiLink';
+import { buildBlockLink, isNoteLinkOnly, parseWikiLink, wikiLinkText } from '../wikiLink';
 
 describe('wiki links', () => {
   it('parses plain, labelled, section and bullet links', () => {
@@ -18,4 +18,12 @@ describe('wiki links', () => {
     expect(parsed.blockId).toBe('blk_x');
     expect(wikiLinkText(parsed)).toBe('Homelab neu › Backups liefen bisher nur manuell – das…');
   });
+
+  it('recognises a bullet that is only a link to a note', () => {
+    expect(isNoteLinkOnly('[[Konzept: Garten]]')).toBe(true);
+    expect(isNoteLinkOnly('[[Konzept: Garten]] #draußen #idee')).toBe(true);
+    expect(isNoteLinkOnly('Siehe [[Konzept: Garten]]')).toBe(false);
+    expect(isNoteLinkOnly('[[Konzept: Garten]] und mehr')).toBe(false);
+    expect(isNoteLinkOnly('Garten')).toBe(false);
+  });
 });