feat: tray-first UX, text outline, start-at-login toggle, font max 200

- All settings move to flat tray menu; right-click on clock disabled
- ClockLabel: custom QPainterPath text rendering with configurable
  glyph outline (BorderColor) — verified pixel-level offscreen
- Fixed glyph positioning bug (baseline math) caught by isolated test
- Window auto-fits content (adjustSize) — no more oversized clock
- Start at Login: checkable tray item, persisted in QSettings,
  LaunchAgent enable/disable (TDD: roundTrip test caught disable()
  returning false when plist already absent)
- Color dialog: hex/HTML input + 'transparent' + native picker fallback;
  opaque colors stored as #RRGGBB
- Border: glyph outline instead of box border; background still painted
  in paintEvent (QSS doesn't render with WA_TranslucentBackground on macOS)
- Removed window shadow (setHasShadow:NO), no bold, SF Pro Rounded
- Font size dialogs allow up to 200 (was 72)
- macOS: icon template 16pt, light/dark auto-adapt; LaunchAgent points
  to /Applications install

tests/autostart_manager_test.cpp

@@ -1,5 +1,6 @@
 #include "autostart_manager.h"
 
+#include <QTemporaryDir>
 #include <QtTest>
 
 class AutoStartManagerTest : public QObject
@@ -8,6 +9,7 @@ class AutoStartManagerTest : public QObject
 
 private slots:
     void createsRunAtLoadLaunchAgent();
+    void roundTripsPlistRoundTrip();
 };
 
 void AutoStartManagerTest::createsRunAtLoadLaunchAgent()
@@ -21,6 +23,26 @@ void AutoStartManagerTest::createsRunAtLoadLaunchAgent()
     QVERIFY(contents.contains("<true/>"));
 }
 
+void AutoStartManagerTest::roundTripsPlistRoundTrip()
+{
+    // Disabled-by-default: no plist written when enable is false,
+    // enableForPath + disable must leave no residue.
+    QTemporaryDir home;
+    QVERIFY(home.isValid());
+    qputenv("HOME", home.path().toUtf8());
+
+    QVERIFY(AutoStartManager::disable());
+    QVERIFY(!QFile::exists(AutoStartManager::launchAgentPath()));
+    QVERIFY(!AutoStartManager::isEnabled());
+
+    QVERIFY(AutoStartManager::enableForPath("/Applications/Clouck.app/Contents/MacOS/Clouck"));
+    QVERIFY(AutoStartManager::isEnabled());
+    QVERIFY(QFile::exists(AutoStartManager::launchAgentPath()));
+
+    QVERIFY(AutoStartManager::disable());
+    QVERIFY(!AutoStartManager::isEnabled());
+}
+
 QTEST_APPLESS_MAIN(AutoStartManagerTest)
 
 #include "autostart_manager_test.moc"