feat: implement user profiles with achievements and primary badge system (#58)

## Summary

This PR implements comprehensive user profile enhancements including:
- User profile pages showing stats, badges, social links, and bio
- Achievement system with 62 achievements across 5 categories
- Primary badge selection allowing users to display their preferred badge
- Admin profile editing capabilities

## Changes

### User Profiles (#45)
- **Frontend**: User profile pages with stats display
  - Profile cards showing avatar, display name, username, and bio
  - Social links section (Website, GitHub, Bluesky, LinkedIn, Twitch, YouTube, Discord)
  - Stats display (suggestions, accepted suggestions, likes, comments)
  - Recent achievements section
  - Badge display
  - Report button for other users' profiles
- **Backend**: Profile API endpoints
  - Get user profile by username or ID
  - Profile includes stats, badges, and achievement points

### Achievement System (#48)
- **Database**: UserAchievement model for tracking progress
- **62 Total Achievements** across 5 categories:
  - **Suggestions (15)**: First suggestion through ultimate curator
  - **Likes (12)**: First like through legendary fan
  - **Comments (12)**: First comment through review legend
  - **Engagement (15)**: Login streaks and activity milestones
  - **Reports (8)**: Valid reports and accuracy tracking
- **Backend**: AchievementService with real-time checking
  - Integrated into all user interaction points
  - API endpoints for achievement data
  - Progress tracking to avoid recalculation
- **Frontend**: Achievements page and profile integration
  - Full achievements page with category filtering
  - Tier-based styling (Bronze, Silver, Gold, Platinum, Diamond)
  - Progress indicators for in-progress achievements
  - Recent achievements on profile pages

### Primary Badge System (#49)
- **Database**: Add primaryBadge field to User model
- **Backend**: Update profile endpoints to include primary badge
- **Frontend**: Primary badge selection in settings
  - Only shows badges the user has earned
  - Displayed on profile page
  - Displayed in comments (next to username)
  - Falls back to no badge if selection is invalid
- **Admin Features**: Admin can edit any user's primary badge

### Admin Enhancements
- Comprehensive profile editing modal for admins
  - Edit display name, bio, slug, social links
  - Set primary badge for users
  - Visual feedback for save/error states
- Admin action buttons in report review modals
  - Ban user, delete comment, edit profile
  - Integrated with report workflow

### Quality Improvements
- Improved dropdown option contrast for readability
- Hide all badges when no primary badge is selected
- "View All" achievements link only shown on own profile
- Improved achievement text readability

## Testing

- ✅ User profiles display correctly with stats and badges
- ✅ Achievement checking works for all interaction types
- ✅ Primary badge selection persists and displays correctly
- ✅ Admin profile editing saves successfully
- ✅ Report workflow integrated with admin actions
- ✅ Achievements page shows all 62 achievements with filtering
- ✅ Text readability improved across components

Closes #45
Closes #48
Closes #49

Co-authored-by: Hikari <hikari@nhcarrigan.com>
Reviewed-on: #58
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

api/src/app/routes/auth/index.ts

@@ -1,7 +1,8 @@
 import { FastifyPluginAsync } from "fastify";
 import { AuthService } from "../../services/auth.service";
 import { AuditService } from "../../services/audit.service";
-import { AuthResponse, AuditAction, AuditCategory } from "@library/shared-types";
+import { AchievementService } from "../../services/achievement.service";
+import { AuthResponse, AuditAction, AuditCategory, AchievementCategory } from "@library/shared-types";
 
 const authRoutes: FastifyPluginAsync = async (app) => {
   const authService = new AuthService(app);
@@ -92,6 +93,15 @@ const authRoutes: FastifyPluginAsync = async (app) => {
         success: true,
       }, request);
 
+      // Update login streak and check engagement achievements
+      const achievementService = new AchievementService();
+      await achievementService.updateLoginStreak(user.id);
+      await achievementService.checkAchievements(
+        user.id,
+        AchievementCategory.Engagement,
+        request
+      );
+
       // Set signed cookies and redirect to frontend
       reply
         .setCookie("auth-token", accessToken, {