feat: write 3 files per solo recording (index + transkript + zusammenfassung)

- pipeline: call write_solo_docs() instead of save_transcript(); broadcast paths dict
- router: /open accepts paths list for Obsidian mode, copies all 3 files to vault
- app.js: store _modalPaths from saved event; Obsidian button sends all paths
- tests: test_write_solo_docs_creates_three_files added

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_output.py

@@ -60,6 +60,25 @@ def test_slugify():
     assert slugify("test  --  foo") == "test-foo"
 
 
+def test_write_solo_docs_creates_three_files(tmp_path):
+    from output import write_solo_docs
+    from datetime import datetime
+    paths = write_solo_docs(
+        raw_text="Das ist der rohe Text vom Mikrofon.",
+        refined="# Projektstatus\n\nDas Projekt läuft gut.\n",
+        output_dir=str(tmp_path),
+        dt=datetime(2026, 4, 2, 15, 0),
+    )
+    assert set(paths.keys()) == {"index", "transkript", "zusammenfassung"}
+    assert all(os.path.exists(p) for p in paths.values())
+    index = open(paths["index"]).read()
+    assert "Projektstatus" in index
+    assert "transkript" in index
+    assert "zusammenfassung" in index
+    assert "Das ist der rohe Text" in open(paths["transkript"]).read()
+    assert "Projekt läuft gut" in open(paths["zusammenfassung"]).read()
+
+
 def test_write_meeting_docs_creates_three_files(tmp_path):
     from output import write_meeting_docs
     from datetime import datetime