feat(FN-3750): stabilize mailbox mobile keyboard and wake handling

- Wire mobile keyboard viewport signals into mailbox view and modal containers for anchored mobile layout
- Keep reply composer focused and visible while keyboard is open, with updated component styles and regression tests
- Make messaging wake dispatch fire-and-forget to avoid request hangs and expand route tests for async behavior
- Add desktop vitest workspace aliases for @fusion/* imports and include FN-3750/FN-3751 changesets

Fusion-Task-Id: FN-3750

packages/dashboard/app/components/MailboxModal.css

@@ -656,6 +656,20 @@
     padding-bottom: calc(var(--space-md) + env(safe-area-inset-bottom, 0px) + var(--standalone-bottom-gap));
   }
 
+  .mailbox-view[style*="--keyboard-overlap"],
+  .mailbox-modal[style*="--keyboard-overlap"] {
+    height: var(--vv-height, 100dvh);
+    max-height: var(--vv-height, 100dvh);
+    transform: translateY(var(--vv-offset-top, 0px));
+    will-change: transform;
+  }
+
+  .mailbox-view[style*="--keyboard-overlap"] .mailbox-content,
+  .mailbox-modal[style*="--keyboard-overlap"] .mailbox-content {
+    overflow-y: auto;
+    min-height: 0;
+  }
+
   .mailbox-modal .mailbox-message-detail-header {
     flex-direction: column;
     align-items: flex-start;
@@ -736,6 +750,10 @@
     padding-bottom: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom, 0px) + var(--standalone-bottom-gap) + var(--space-lg));
   }
 
+  .mailbox-view[style*="--keyboard-overlap"] .mailbox-content {
+    padding-bottom: calc(env(safe-area-inset-bottom, 0px) + var(--space-md));
+  }
+
   .mailbox-view .mailbox-split-layout {
     display: block;
     height: auto;