feat(calendar-lab): replace tldraw with two-layer panzoom canvas

Drop tldraw/React dependency in favor of @panzoom/panzoom with a
two-layer architecture: outline rectangles (borders only) are zoomed
via CSS transforms while HTML content renders at native 1:1 scale
as a fade-in overlay — eliminating blur at any zoom level.

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/app/pages/calendar-zoom-lab.vue

@@ -1,9 +1,9 @@
 <script setup lang="ts">
-import CrmCalendarZoomTldrawLab from "~~/app/components/workspace/calendar/lab/CrmCalendarZoomTldrawLab.client.vue";
+import CrmCalendarZoomCanvasLab from "~~/app/components/workspace/calendar/lab/CrmCalendarZoomCanvasLab.vue";
 </script>
 
 <template>
   <main class="h-dvh w-full bg-base-200/40 p-2">
-    <CrmCalendarZoomTldrawLab />
+    <CrmCalendarZoomCanvasLab />
   </main>
 </template>