feat: smart video size warnings + Jinja2 template autocomplete

Video size warnings:
- Add file_size field to ImmichAssetInfo from exifInfo.fileSizeInByte
- Expose per-target max_video_size (50 MB for Telegram, none for others)
- Compute has_oversized_videos and per-asset oversized flag in template context
- Default templates show warning only when videos actually exceed the limit
- Templates no longer hardcode Telegram-specific logic

Template autocomplete:
- New jinja-autocomplete.ts engine with contextual completions
- Top-level variables ({{ }}), asset/album fields (dot access in loops),
  Jinja2 filters (|), block tags ({% %}), and loop.* special vars
- JinjaEditor accepts optional variables prop via CodeMirror Compartment
- Wired into template-configs and command-template-configs pages

Also: fix template emoji (📷 → 📎) and sync sample_context with new vars.

packages/server/src/notify_bridge_server/services/sample_context.py

@@ -1,4 +1,12 @@
-"""Sample template context for previews and test notifications."""
+"""Sample template context for previews and test notifications.
+
+IMPORTANT: Keep sample assets and context in sync with:
+- ``notify_bridge_core.templates.context.build_template_context`` (runtime variables)
+- ``notify_bridge_server.api.template_configs`` (variable docs)
+- ``notify_bridge_core.templates.validator`` (runtime_vars whitelist)
+
+When adding new template variables, update all four locations.
+"""
 
 # Sample asset matching what build_asset_detail() actually returns
 _SAMPLE_ASSET = {
@@ -21,6 +29,8 @@ _SAMPLE_ASSET = {
     "public_url": "https://immich.example.com/share/abc123/photos/a1b2c3d4-e5f6-7890-abcd-ef1234567890",
     "download_url": "https://immich.example.com/api/assets/abc123/original",
     "photo_url": "https://immich.example.com/api/assets/abc123/thumbnail",
+    "file_size": 3_500_000,  # 3.5 MB
+    "oversized": False,
 }
 
 _SAMPLE_VIDEO_ASSET = {
@@ -33,6 +43,8 @@ _SAMPLE_VIDEO_ASSET = {
     "photo_url": None,
     "public_url": "https://immich.example.com/share/abc123/photos/d4e5f6a7-b8c9-0123-defg-456789abcdef",
     "playback_url": "https://immich.example.com/api/assets/def456/video",
+    "file_size": 75_000_000,  # 75 MB — exceeds Telegram's 50 MB limit
+    "oversized": True,
 }
 
 _SAMPLE_COLLECTION = {
@@ -68,6 +80,9 @@ _SAMPLE_CONTEXT = {
     "target_type": "telegram",
     "has_videos": True,
     "has_photos": True,
+    "has_oversized_videos": True,
+    "max_video_size": 50 * 1024 * 1024,  # 50 MB in bytes
+    "max_video_size_mb": 50,
     # Rename fields (always present, empty for non-rename events)
     "old_name": "Old Album",
     "new_name": "New Album",