Add gamification, micro-animations, and a mini-game for empty states

Applies a few Hook Model (trigger/action/reward/investment) patterns on top
of the existing swipe/match loop:

- Daily streak: a flame badge in the home header, backed by the new
  checkin endpoint — an external trigger to return daily.
- Profile completeness meter + badge collection on the profile page
  (client-computed from existing data) — the investment loop nudging
  users to fill out bio/photos/answers.
- Bio editor on the profile page, shown on swipe cards and candidate
  detail so profiles read richer.
- Catch the Hearts: a small tap mini-game (falling hearts, bonus items,
  20s timer, persisted high score) shown instead of a dead end when the
  discover feed runs out, so there's still a reason to stay in the app.
- Micro-animations: heart-burst on like, confetti on match, tap feedback
  on all buttons (active:scale-95).

Fixed a React "purity" lint violation along the way (Math.random() can't
be called inside useMemo under this project's rules — moved to useState
lazy initializers, which run once on mount as intended).

src/lib/api.ts

@@ -46,6 +46,8 @@ export interface UserProfile {
   approval_status: ApprovalStatus;
   rejection_reason?: string;
   is_admin: boolean;
+  bio?: string;
+  streak_count: number;
 }
 
 export interface TokenPair {
@@ -125,6 +127,7 @@ export interface DiscoverCandidate {
   id: number;
   first_name: string;
   age: number;
+  bio?: string;
   photos: string[];
   distance_km?: number;
   interests?: string[];
@@ -139,6 +142,7 @@ export interface CandidateDetail {
   id: number;
   first_name: string;
   age: number;
+  bio?: string;
   photos: string[];
   distance_km?: number;
   height_cm?: number;
@@ -420,6 +424,22 @@ export function updateLocation(latitude: number, longitude: number) {
   });
 }
 
+export function updateBio(bio: string) {
+  return authRequest<null>("/profile/bio", {
+    method: "PATCH",
+    body: JSON.stringify({ bio }),
+  });
+}
+
+export interface CheckInResult {
+  streak_count: number;
+  is_new_today: boolean;
+}
+
+export function checkIn() {
+  return authRequest<CheckInResult>("/profile/checkin", { method: "POST" });
+}
+
 // ---------------- دوستیابی ----------------
 
 export function getDiscoverFeed(params?: {