Sync user preferences to cloud storage

tsconfig.json

@@ -35,6 +35,7 @@
     "**/node_modules",
     "web/workers/competition-api/test",
     "web/workers/auth-api/src",
+    "web/workers/auth-api/test",
     "web/workers/mcp-api/src",
     "web/workers/mcp-api/test"
   ]

web/db/migrations/0007_user_preferences.sql

@@ -0,0 +1,17 @@
+-- Per-user app preferences and custom theme. Replaces the
+-- `glidecomp:preferences` and `glidecomp:theme` localStorage keys for
+-- authenticated users so settings sync across devices.
+--
+-- One row per user. Both blobs are opaque JSON owned by the client; the
+-- server only enforces size limits and treats them as strings.
+--
+-- theme_json is nullable so "reset to default" is a clean NULL rather than
+-- a sentinel value. CASCADE on user delete piggybacks on the existing
+-- account-deletion flow — no extra cleanup code needed.
+
+CREATE TABLE "user_preferences" (
+  "user_id" TEXT PRIMARY KEY NOT NULL REFERENCES "user"("id") ON DELETE CASCADE,
+  "prefs_json" TEXT NOT NULL DEFAULT '{}',
+  "theme_json" TEXT,
+  "updated_at" TEXT NOT NULL DEFAULT (datetime('now'))
+);

web/frontend/package.json

@@ -9,16 +9,19 @@
     "build": "vite build",
     "preview": "vite preview",
     "deploy": "vite build && wrangler pages deploy dist --project-name=glidecomp",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run"
   },
   "//": "Basecoat fork - see docs/basecoat-fork.md for build/publish instructions",
   "devDependencies": {
     "@cloudflare/workers-types": "^4.20260509.1",
     "@tailwindcss/vite": "^4.3.0",
     "@pokle/basecoat": "0.3.10-beta3.pokle-selections",
+    "jsdom": "^25.0.1",
     "tailwindcss": "^4.3.0",
     "typescript": "^6.0.3",
     "vite": "^7.3.3",
+    "vitest": "^4.1.5",
     "wrangler": "4.87.0"
   },
   "dependencies": {

web/frontend/src/analysis/config.ts

@@ -1,9 +1,13 @@
 /**
  * Configuration storage abstraction.
- * Currently backed by localStorage, designed for future migration to backend API.
+ *
+ * localStorage is the synchronous read cache; cloud sync (when signed in)
+ * is layered on top via auth/preferences-sync, which observes mutations
+ * through schedulePush() and reconciles on startup via clearCache().
  */
 
 import { resolveThresholds, DEFAULT_GAP_PARAMETERS, type DetectionThresholds, type PartialThresholds, type GAPParameters } from '@glidecomp/engine';
+import { preferencesSync } from '../auth/preferences-sync';
 
 export interface MapLocation {
   center: [lng: number, lat: number];
@@ -98,6 +102,8 @@ class ConfigStore {
         detail: merged,
       })
     );
+
+    preferencesSync.schedulePush('prefs');
   }
 
   /**