feat: usage quota visualization in AI settings

No user-facing view of AI-call/recipe/storage usage existed — only an
admin-only per-user panel. Adds the same numbers, with progress bars
against the user's actual tier limits (read fresh from the DB, not
the cached session), to Settings > AI.

v0.40.0

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.39.0";
+export const APP_VERSION = "0.40.0";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.40.0",
+    date: "2026-07-17 14:00",
+    added: [
+      "AI Settings now shows a usage panel — AI calls, recipes created, and storage used this month against your tier's limits, with progress bars.",
+    ],
+  },
   {
     version: "0.39.0",
     date: "2026-07-17 13:30",