Replace collapsible stream groups with sub-tabs navigation

- Replace expandable/collapsible groups with tab bar (Screen Capture, Static Image, Processed)
- Persist active stream tab in localStorage
- Shorten tab labels by removing "Streams" suffix
- Remove type badge from cards (redundant with tab separation)
- Add count badge on each tab with active highlight

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

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

@@ -200,8 +200,8 @@
   "common.edit": "Edit",
   "streams.title": "\uD83D\uDCFA Picture Streams",
   "streams.description": "Picture streams define the capture pipeline. A raw stream captures from a display using a capture template. A processed stream applies postprocessing to another stream. Assign streams to devices.",
-  "streams.group.raw": "Screen Capture Streams",
-  "streams.group.processed": "Processed Streams",
+  "streams.group.raw": "Screen Capture",
+  "streams.group.processed": "Processed",
   "streams.add": "Add Picture Stream",
   "streams.add.raw": "Add Screen Capture",
   "streams.add.processed": "Add Processed Stream",
@@ -281,7 +281,7 @@
   "device.stream_settings.smoothing": "Smoothing:",
   "device.stream_settings.smoothing_hint": "Temporal blending between frames (0=none, 1=full). Reduces flicker.",
   "device.tip.stream_selector": "Configure picture stream and LED projection settings for this device",
-  "streams.group.static_image": "Static Image Streams",
+  "streams.group.static_image": "Static Image",
   "streams.add.static_image": "Add Static Image",
   "streams.edit.static_image": "Edit Static Image",
   "streams.type.static_image": "Static Image",