Merge branch 'feat/footer-share-ci' into dev

CI keeps the 'test once per code state' plan but records commit and
git tree as image labels instead of extra :sha-/:tree- tags, so the
registry only holds dev, latest, vX.Y.Z and stable; the plan test now
asserts the expected decisions.

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

frontend/src/lib/__tests__/shareTarget.test.ts

@@ -0,0 +1,87 @@
+import { describe, it, expect } from 'vitest';
+import { formatSharedThought } from '../shareTarget';
+
+describe('formatSharedThought', () => {
+  it('formats pure text correctly', () => {
+    expect(formatSharedThought({ text: 'Spontaner Einfall' })).toBe('Spontaner Einfall');
+  });
+
+  it('formats pure url correctly', () => {
+    expect(formatSharedThought({ url: 'https://example.com/article' })).toBe('https://example.com/article');
+  });
+
+  it('combines title and url when text is empty', () => {
+    expect(formatSharedThought({ title: 'Toller Artikel', url: 'https://example.com/article' }))
+      .toBe('Toller Artikel\nhttps://example.com/article');
+  });
+
+  it('does not duplicate URL when text already contains it', () => {
+    const input = {
+      title: 'Artikel',
+      text: 'Lies das hier: https://example.com/article unbedingt!',
+      url: 'https://example.com/article',
+    };
+    expect(formatSharedThought(input))
+      .toBe('Artikel\nLies das hier: https://example.com/article unbedingt!');
+  });
+
+  it('does not duplicate URL when text is exactly the URL', () => {
+    const input = {
+      title: 'News',
+      text: 'https://news.example.com',
+      url: 'https://news.example.com',
+    };
+    expect(formatSharedThought(input))
+      .toBe('News\nhttps://news.example.com');
+  });
+
+  it('does not duplicate title if text starts with title', () => {
+    const input = {
+      title: 'MindSift Update',
+      text: 'MindSift Update ist jetzt verfügbar.',
+    };
+    expect(formatSharedThought(input))
+      .toBe('MindSift Update ist jetzt verfügbar.');
+  });
+
+  it('combines title, text and distinct URL', () => {
+    const input = {
+      title: 'Empfehlung',
+      text: 'Ein großartiges Tool für schnelles Erfassen.',
+      url: 'https://mindsift.app',
+    };
+    expect(formatSharedThought(input))
+      .toBe('Empfehlung\nEin großartiges Tool für schnelles Erfassen.\nhttps://mindsift.app');
+  });
+
+  it('handles image with text', () => {
+    const input = {
+      title: 'Foto vom Ausflug',
+      fileName: 'berge.jpg',
+      hasMedia: true,
+    };
+    expect(formatSharedThought(input))
+      .toBe('Foto vom Ausflug\n(Bild geteilt – Bilder im Posteingang werden noch nicht unterstützt)');
+  });
+
+  it('handles image only with filename', () => {
+    const input = {
+      fileName: 'screenshot.png',
+      hasMedia: true,
+    };
+    expect(formatSharedThought(input))
+      .toBe('[screenshot.png] (Bild geteilt – Bilder im Posteingang werden noch nicht unterstützt)');
+  });
+
+  it('handles image only without filename', () => {
+    const input = {
+      hasMedia: true,
+    };
+    expect(formatSharedThought(input))
+      .toBe('(Bild geteilt – Bilder im Posteingang werden noch nicht unterstützt)');
+  });
+
+  it('returns empty string if nothing is provided', () => {
+    expect(formatSharedThought({})).toBe('');
+  });
+});