Fix achievement icons in launcher, allow opening OAuth URLs, live map docs

- Shared achievement icon catalogue; launcher resolves icon/background/border ids
- Tauri opener capability now allows http(s) URLs (fixes Discord sign-in)
- Rewrite live map docs, admin guide progression section

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DjMbLQujBHunCCu5GpsHaT

launcher/src/pages/Quests.svelte

@@ -4,6 +4,7 @@
     Target, Trophy, Clock, Sparkles, Check, Gift, Pickaxe, Swords, Hammer,
     Wheat, Users, Compass, RefreshCw, LoaderCircle, Flame, Star, Award, Shield
   } from '@lucide/svelte';
+  import AchievementIcon from '../components/AchievementIcon.svelte';
   import { invoke } from '../lib/tauri';
   import { toast } from '../lib/store.svelte';
   import type { UserLevelInfo, ServerLevelInfo, UserQuest, Achievement } from '../lib/types';
@@ -217,9 +218,7 @@
       <div class="achievements-grid">
         {#each achievements as ach (ach.id)}
           <div class="achievement-card glass" class:unlocked={ach.unlocked} class:frame-task={ach.frame_type === 'task'} class:frame-goal={ach.frame_type === 'goal'} class:frame-challenge={ach.frame_type === 'challenge'}>
-            <div class="achievement-icon-frame" style:background={ach.icon_bg || 'rgba(0,0,0,0.5)'} style:border-color={ach.icon_border || 'var(--line)'}>
-              <span class="sprite-icon">{ach.icon_item || '💎'}</span>
-            </div>
+            <AchievementIcon {ach} locked={!ach.unlocked} />
             <div class="achievement-body">
               <div class="achievement-header">
                 <span class="ach-title">{ach.title}</span>