fix(web): calm hero flash, lead detail, and scope sources

Keep the dashboard backdrop out of flow on first paint, clamp long lead notes, scroll the quick-actions rail, return to the lead board, and only list import sources that exist in this environment.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/components/dashboard/HomeHero.vue

@@ -63,10 +63,14 @@ const shortcutLabel = computed(() =>
 </script>
 
 <template>
-  <header class="hero">
-    <div class="hero-surface" aria-hidden="true">
-      <div class="hero-glow" />
-      <div class="hero-mist" />
+  <header class="hero" style="position: relative">
+    <div
+      class="hero-surface"
+      aria-hidden="true"
+      style="position: absolute; inset: 0; overflow: hidden; pointer-events: none"
+    >
+      <div class="hero-glow" style="position: absolute" />
+      <div class="hero-mist" style="position: absolute; inset: 0" />
     </div>
 
     <div class="hero-body">