Move color strip sources from Targets tab to Sources tab

- Remove csColorStrips CardSection from targets.js, add to streams.js
- Add color_strip sub-tab with tree nav entry between Picture and Audio
- Update navigateToCard refs in target cards and command palette
- Update tutorial steps: remove led-css from targets, add color_strip to sources
- Add i18n keys for streams.group.color_strip and tour.src.color_strip

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

server/src/wled_controller/static/locales/zh.json

@@ -304,6 +304,7 @@
   "tour.src.templates": "捕获模板 — 可复用的捕获配置（分辨率、FPS、裁剪）。",
   "tour.src.static": "静态图片 — 使用图片文件测试您的设置。",
   "tour.src.processed": "处理 — 应用后处理效果，如模糊、亮度或色彩校正。",
+  "tour.src.color_strip": "色带 — 定义屏幕区域如何映射到 LED 段。",
   "tour.src.audio": "音频 — 分析麦克风或系统音频以实现响应式 LED 效果。",
   "tour.src.value": "数值 — 用于自动化条件的数字数据源。",
   "tour.src.sync": "同步时钟 — 在多个源之间同步动画的共享定时器。",
@@ -365,6 +366,7 @@
   "streams.description": "源定义采集管线。原始源使用采集模板从显示器采集。处理源对另一个源应用后处理。将源分配给设备。",
   "streams.group.raw": "屏幕采集",
   "streams.group.processed": "已处理",
+  "streams.group.color_strip": "色带源",
   "streams.group.audio": "音频",
   "streams.section.streams": "源",
   "streams.add": "添加源",