feat: daylight tz, camera engine, value stream + modal/UI polish

- daylight: new daylight_settings module + daylight-tz frontend helper; expanded daylight_stream behavior
- camera engine: capture path additions plus new test_camera_engine suite
- value stream: schema + processing updates (~178 lines)
- color strip: drop cycle effect (cycle.py / color-cycle.ts removed), tighten static path
- modal CSS: large refactor (+883), components.css polish (+110)
- templates: settings, css-editor, value-source-editor, test-template, display-picker, image-lightbox
- frontend core: state, modal, icons, graph-nodes, app
- frontend features: displays, streams, streams-capture-templates, value-sources, settings, color-strips/cards
- locales: en/ru/zh
- storage: color_strip, picture_source, value_source loaders touched
- preferences/sync_clocks/picture_sources routes; home_assistant + templates schemas

server/tests/e2e/test_color_strip_flow.py

@@ -135,22 +135,6 @@ class TestColorStripSourceLifecycle:
         resp = client.post("/api/v1/color-strip-sources", json=payload)
         assert resp.status_code == 400  # duplicate name
 
-    def test_color_cycle_source(self, client):
-        """Color cycle sources store and return their color list."""
-        resp = client.post(
-            "/api/v1/color-strip-sources",
-            json={
-                "name": "Rainbow Cycle",
-                "source_type": "color_cycle",
-                "colors": [[255, 0, 0], [0, 255, 0], [0, 0, 255]],
-                "led_count": 30,
-            },
-        )
-        assert resp.status_code == 201
-        data = resp.json()
-        assert data["source_type"] == "color_cycle"
-        assert data["colors"] == [[255, 0, 0], [0, 255, 0], [0, 0, 255]]
-
     def test_effect_source(self, client):
         """Effect sources store their effect parameters."""
         resp = client.post(