chore: migrate all FA icons to Lucide (@lucide/svelte)

- Replaced all active FontAwesome <span class="fas fa-*"> icons with
  Lucide components across 145 files (excluding /idaa/ which is intentional)
- Fixed merge script bug: consolidated lucide-svelte imports into @lucide/svelte
- Replaced dynamic toggle patterns (fa-toggle-on/off) with ToggleRight/ToggleLeft
- Replaced fa-eye/fa-eye-slash with Eye/EyeOff
- Replaced fa-bug/fa-bug-slash with Bug/BugOff
- Replaced fa-sync fa-spin with RefreshCw + animate-spin
- Replaced fa-microchip with Cpu
- Fixed {@const} placement in element_manage_event_file_li.svelte
- Removed obsolete CSS hover rules for .unlock_icon/.lock_icon
- svelte-check: 0 errors, 0 warnings

src/routes/events/[event_id]/(launcher)/launcher_background_sync.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+    import { ChevronDown, ChevronUp, Cpu, RefreshCw } from '@lucide/svelte';
     /**
      * launcher_background_sync.svelte
      * Exhaustive Background Pre-Caching Engine with Loop Monitoring.
@@ -522,14 +523,14 @@
         "
         title="Native Sync Monitor · {sync_stats.cached}/{sync_stats.total} files · click to {show_monitor ? 'close' : 'open'}"
     >
-        <span class="fas {currently_syncing ? 'fa-sync fa-spin text-primary-500' : 'fa-microchip opacity-50'} text-[9px]"></span>
+        {#if currently_syncing}<RefreshCw size="1em" class="text-[9px] animate-spin text-primary-500" />{:else}<Cpu size="1em" class="text-[9px] opacity-50" />{/if}
         {#if currently_syncing}
             <span class="truncate max-w-40 text-left">{currently_syncing}</span>
         {:else}
             <span>Native Sync</span>
             <span class="opacity-50 ml-0.5">{sync_stats.cached}/{sync_stats.total}</span>
         {/if}
-        <span class="fas {show_monitor ? 'fa-chevron-down' : 'fa-chevron-up'} text-[7px] opacity-40 ml-0.5"></span>
+        {#if show_monitor}<ChevronDown size="1em" class="text-[7px] opacity-40 ml-0.5" />{:else}<ChevronUp size="1em" class="text-[7px] opacity-40 ml-0.5" />{/if}
     </button>
 </div>
 {/if}