fix: full-stack E2E hardening — client blobs, modal errors, audit coverage, MCP context

- api-client: getResponseBody returns Blob for non-JSON (fixes storage
  preview/download TypeError); postgen.mjs reapplies the patch on regen
- Modal: error prop renders inside the dialog so request failures are
  visible instead of hidden behind the overlay (6 pages wired)
- lib/api: extract server-provided error message from error.body
- Modal: unique id per instance (duplicate modal-title broke aria-label)
- nginx: index.html no-cache + immutable /assets (stale shell pointed at
  deleted hashed assets after redeploy → white screen)
- vite: drop dead Google Fonts runtime caching (fonts are vendored)
- functions: audit function.created/updated/deleted/invoked
- AuditPage: expand action filter to all recorded actions
- MCP: whoami uses /context for API keys; projectId/orgId resolve via
  /context with auth-aware precedence (stale `primora use` selection can
  never authorize a differently-scoped key)

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/frontend/src/lib/api.ts

@@ -12,3 +12,20 @@ OpenAPI.TOKEN = async () => (await fetchApiToken()) ?? "";
 export function configureApiToken(tokenResolver?: () => Promise<string | undefined>) {
   OpenAPI.TOKEN = tokenResolver ? async () => (await tokenResolver()) ?? "" : async () => (await fetchApiToken()) ?? "";
 }
+
+/**
+ * Extracts a human-readable message from an API failure.
+ * ApiError.message is only the HTTP status text ("Bad Request") — the backend
+ * sends the actionable reason in body.error.message. Prefer it.
+ */
+export function errorMessage(error: unknown, fallback = "Request failed"): string {
+  if (error && typeof error === "object") {
+    const body = (error as { body?: { error?: { message?: unknown } } }).body;
+    if (typeof body?.error?.message === "string" && body.error.message.length > 0) {
+      return body.error.message;
+    }
+    const message = (error as { message?: unknown }).message;
+    if (typeof message === "string" && message.length > 0) return message;
+  }
+  return fallback;
+}