feat: add random song tool with level filters and shareable history

offline/OfflineApp.svelte

@@ -6,6 +6,7 @@
   import AnalysisPage from '../src/routes/analysis/+page.svelte';
   import RatingPage from '../src/routes/rating/+page.svelte';
   import CombinationPage from '../src/routes/combination/+page.svelte';
+  import ToolsPage from '../src/routes/tools/+page.svelte';
   import EventPage from '../src/routes/event/+page.svelte';
   import DataPage from '../src/routes/data/+page.svelte';
   import DataCardsPage from '../src/routes/data/cards/+page.svelte';
@@ -21,6 +22,9 @@
     ['/analysis', AnalysisPage],
     ['/rating', RatingPage],
     ['/combination', CombinationPage],
+    ['/tools', ToolsPage],
+    ['/tools/random', ToolsPage],
+    ['/random', ToolsPage],
     ['/event', EventPage],
     ['/data', DataPage],
     ['/data/cards', DataCardsPage],
@@ -85,6 +89,7 @@
       {#if showEventTab}<a href="#/event" aria-current={currentPath.startsWith('/event') ? 'page' : undefined}>이벤트 Pt</a>{/if}
       <a href="#/data" aria-current={currentPath.startsWith('/data') ? 'page' : undefined}>사용자 데이터</a>
       <a href="#/updates" aria-current={currentPath.startsWith('/updates') ? 'page' : undefined}>업데이트 내역</a>
+      <a href="#/tools" aria-current={currentPath.startsWith('/tools') || currentPath === '/random' ? 'page' : undefined}>도구</a>
       <a
         class="feedback-link"
         href="https://docs.google.com/forms/d/1z9c0c1crbCO6avXaYwrHZjhw2ib3zgAmW4ijJDTo4DM"