Add clipboard workflow tests

tests/test_clipboard_capture.py

@@ -0,0 +1,16 @@
+from ai_typewriter.clipboard_capture import capture_clipboard, capture_selection
+
+
+def test_capture_clipboard_reads_current_clipboard(monkeypatch):
+    monkeypatch.setattr("ai_typewriter.clipboard_capture.pyperclip.paste", lambda: "phrase copiée")
+
+    assert capture_clipboard() == "phrase copiée"
+
+
+def test_legacy_capture_selection_does_not_copy_or_modify_clipboard(monkeypatch):
+    calls = []
+    monkeypatch.setattr("ai_typewriter.clipboard_capture.pyperclip.paste", lambda: "déjà copié")
+    monkeypatch.setattr("ai_typewriter.clipboard_capture.pyperclip.copy", lambda value: calls.append(value), raising=False)
+
+    assert capture_selection() == "déjà copié"
+    assert calls == []