feat(documents-hub): NewDocumentMenu dropdown + FolderDropZone drag-drop

Replaces the bare "+ New document" Button on the documents hub with a
NewDocumentMenu dropdown so reps explicitly pick between:
- "Upload file" → opens a Dialog with FileUploadZone scoped to the
  current folder + entity context. No signing flow attached.
- "Generate document for signing" → navigates to /documents/new wizard.

Avoids the prior ambiguity where reps clicked "+ New document" intending
to attach a file and were dropped into the Documenso signer wizard.

Also adds FolderDropZone wrapping FlatFolderListing and EntityFolderView.
Dragging files from the OS over the current folder shows a drop overlay;
drop fires N parallel uploads carrying the folder + entity context.
Mirrors the per-entity Files tab UX but works in-place on the hub.

Both surfaces hit /api/v1/files/upload with folderId + entityType/Id +
the legacy clientId/companyId/yachtId FKs so files land on the right
entity AND inside the correct folder.

Also includes the in-flight prettier reformat from lint-staged on a
few previously-touched files (create-document-wizard, file-upload-zone,
admin/documenso/page) and adds the standalone prod-readiness audit
report to docs/superpowers/audits/ for permanent reference.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/dashboard/dashboard-shell.tsx

@@ -73,9 +73,7 @@ export function DashboardShell() {
   const firstName = me.data?.data?.firstName?.trim();
   // Time-aware greeting line, falls back to a generic "Welcome back" when
   // we don't know the user's first name yet (e.g. profile not filled out).
-  const greeting = firstName
-    ? `${timeOfDayGreeting()}, ${firstName}`
-    : 'Welcome back';
+  const greeting = firstName ? `${timeOfDayGreeting()}, ${firstName}` : 'Welcome back';
 
   // Use a partial query-key prefix (no range segment) for invalidations.
   // Reading: "any cached analytics result, regardless of range, please