feat: billing/invoice details (full name, address, phone) under Settings > Billing (v0.76.0)

Adds a new user_billing_details table (1:1 with users, separate from the display name) with a form and GET/PUT API route. Full name is required by the form/API; address and phone stay optional. Not wired into Stripe invoicing yet — just captured for future use.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.75.0";
+export const APP_VERSION = "0.76.0";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.76.0",
+    date: "2026-07-24 12:15",
+    added: [
+      "Settings -> Billing now has a billing/invoice details section: full name (required), address, and phone number (both optional). Separate from your display name — this is what will appear on future invoices.",
+    ],
+  },
   {
     version: "0.75.0",
     date: "2026-07-24 11:30",