fix(kon): spinner direction, sidebar nav lock, rebrand to Kon

- Spinner: reversed sinhala-spin from counter-clockwise to clockwise
- Sidebar nav lock: removed {#key page.current} block that forced full
  destroy/recreate of pages on every navigation. DictationPage's AudioWorklet
  cleanup in onDestroy was blocking the UI during the {#key} destruction cycle.
  Now uses {#if} blocks only — smoother page transitions.
- Rebranded sidebar: Ramble → Kon, v0.2 → v1.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/routes/+page.svelte

@@ -13,17 +13,15 @@
 </script>
 
 <div class="h-full overflow-hidden">
-  {#key page.current}
-    {#if page.current === "dictation"}
-      <DictationPage />
-    {:else if page.current === "files"}
-      <FilesPage />
-    {:else if page.current === "tasks"}
-      <TasksPage />
-    {:else if page.current === "history"}
-      <HistoryPage />
-    {:else if page.current === "settings"}
-      <SettingsPage />
-    {/if}
-  {/key}
+  {#if page.current === "dictation"}
+    <DictationPage />
+  {:else if page.current === "files"}
+    <FilesPage />
+  {:else if page.current === "tasks"}
+    <TasksPage />
+  {:else if page.current === "history"}
+    <HistoryPage />
+  {:else if page.current === "settings"}
+    <SettingsPage />
+  {/if}
 </div>