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/files/file-upload-zone.tsx

@@ -85,9 +85,9 @@ export function FileUploadZone({
               throw new Error('Upload failed');
             }
 
-            const uploadJson = (await uploadRes
-              .json()
-              .catch(() => null)) as { data?: { id?: string; filename?: string } } | null;
+            const uploadJson = (await uploadRes.json().catch(() => null)) as {
+              data?: { id?: string; filename?: string };
+            } | null;
             if (uploadJson?.data?.id) {
               onUploadComplete?.({
                 id: uploadJson.data.id,