Add workspace file browser and OpenAlex citation search

Workspace browser:
- The left panel gains a Project/Workspace toggle; the Workspace view
  browses the agent scratch space (claude-workspace/, never synced)
- Open/edit workspace text files in the editor with debounced auto-save
  (flushed on tab switch); binaries open with the system default app
- Import to Project copies a workspace file/folder into the project root
  where the sync bridge picks it up and creates it on Overleaf
  (collision-safe: falls back to a -imported suffix)
- New file/folder, rename, delete, reveal in Finder, drag-drop into the
  workspace, 5s auto-refresh while visible

OpenAlex search (MCP):
- New search_openalex tool: broad OpenAlex coverage with an explicit
  citation-authority policy — BibTeX is cross-checked against Semantic
  Scholar (by DOI, then by exact title, since OpenAlex DOIs can point at
  mirrors); entries not found on S2 are flagged "OpenAlex only" with
  instructions to verify via web search before citing
- Tool description, agent guide, permission allowlist, and README updated

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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