Add unlabelled event detection, stub parser quality, Sync All, and modern UI redesign

Key changes:
- Unlabelled event banner: shows count only after Sample Events is clicked; uses broad SDL filter expression; time window synced to sync-days dropdown
- Parser Quality: new "Attributes Missing" subsection listing all parsers without dataSource.name regardless of event volume
- Coverage map: filter buttons (All / Complete Parser / Attributes Missing); stat card renamed to "Incomplete Parser"; stub count excluded from sync when no active sources
- Sync All button: runs SDL parser sync → library sync → live sources sync in sequence
- Reset now clears ActiveSource table and resets unlabelled count cache
- run_powerquery: configurable max_count param (default 1000, 50M for count queries)
- _DS_NAME_RE: supports both quoted and unquoted dataSource.name keys in parser files
- Full modern UI redesign: slate palette, gradient cards, ring borders, pill nav, colored stat accents
- Updated 7 tracked parser files synced from SDL

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

backend/routers/settings.py

@@ -14,6 +14,7 @@ FIELDS = [
     {"key": "S1_API_TOKEN",         "label": "Console API Token",             "secret": True,  "placeholder": "eyJ..."},
     {"key": "SDL_XDR_URL",          "label": "SDL XDR URL",                   "secret": False, "placeholder": "https://xdr.us1.sentinelone.net"},
     {"key": "SDL_LOG_READ_KEY",     "label": "SDL Log Read Key",              "secret": True,  "placeholder": "1DnK0Y4e..."},
+    {"key": "SDL_CONFIG_READ_KEY",       "label": "SDL Config Read Key",           "secret": True,  "placeholder": "Needs 'Manage config files' permission"},
     {"key": "ANTHROPIC_API_KEY",    "label": "Anthropic API Key",             "secret": True,  "placeholder": "sk-ant-..."},
 ]