added a new collection called documents that contains only letters, files and documents

[Ajay-AJ7899]

In this PR, the backend and UI were extended to support a new “documents” mode alongside the existing people‑based browsing. The shared FileItem type in cache.ts now includes an optional type field so items can be labelled as documents, or other file kinds. In the worker index.ts, helper constants and functions were introduced to recognize document‑like objects (by extension or name keywords), and the /api/all-files and /api/files responses were updated to propagate this type and classify each file accordingly. A new POST endpoint, /api/build-documents-index, was added to scan the R2 bucket for document‑type files and write a dedicated indexes/documents-index.json containing only those entries. On the frontend, celebrity-combobox.tsx was generalized with placeholder and allLabel props plus adaptive empty‑state text so it can be reused for documents as well as people. Finally, file-browser.tsx gained a searchMode (People/Documents), a mode selector, a virtual “Documents” collection in the dropdown, a derived documentsList wired into the combobox, and updated collection filtering logic that treats "documents" as a virtual collection showing only items where type === "document".

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