fix: backfill symbol_demand for sidebar-added symbols + analyst ratings schema fix

- Add await ctx.cache.subscribe() to addSymbol mutation so symbols
  added via the sidebar get registered in symbol_demand and yfinance
  jobs are queued immediately
- Backfill PEP, WYNN, STZ, CELH into symbol_demand + adapter_queue
- Upgrade yahoo-finance2 3.15.3 -> 3.15.4 and pass validateResult:false
  to quoteSummary() to handle Yahoo schema drift
- Add error detail logging for analyst ratings schema failures
- Update .gitignore with common ignores

app/types/node-sqlite.d.ts

@@ -0,0 +1,33 @@
+// Ambient module shim for `node:sqlite`.
+//
+// The SPA tsconfig compiles against @types/node v20, which predates the
+// `node:sqlite` built-in (added in Node 22.5). The backend (app/server) runs on
+// Node 22+ and imports `node:sqlite` for real. A few server modules get pulled
+// into the SPA type-check via `import type` edges from __tests__; this shim lets
+// the SPA type-check those modules without a runtime dependency. The backend's
+// own tsconfig (with a newer @types/node) is unaffected because the module is
+// genuinely provided at runtime.
+
+declare module "node:sqlite" {
+  export interface SqliteStatement {
+    run(...params: unknown[]): unknown;
+    get(...params: unknown[]): unknown;
+    all(...params: unknown[]): unknown[];
+    iterate(...params: unknown[]): IterableIterator<unknown>;
+    [key: string]: unknown;
+  }
+
+  export interface DatabaseSyncOptions {
+    location?: string;
+    nativeBinding?: string;
+    [key: string]: unknown;
+  }
+
+  export class DatabaseSync {
+    constructor(path?: string, options?: DatabaseSyncOptions);
+    exec(sql: string): unknown;
+    prepare(sql: string): SqliteStatement;
+    close(): void;
+    [key: string]: unknown;
+  }
+}