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>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/preload/index.ts b/src/preload/index.ts
index d3cddea..a4d8179 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -12,8 +12,20 @@ window.addEventListener('wheel', (e) => {
 
 const api = {
   // File system
-  readFile: (path: string) => ipcRenderer.invoke('fs:readFile', path),
+  readFile: (path: string) => ipcRenderer.invoke('fs:readFile', path) as Promise<string>,
   readBinary: (path: string) => ipcRenderer.invoke('fs:readBinary', path) as Promise<ArrayBuffer>,
+  writeFile: (path: string, content: string) => ipcRenderer.invoke('fs:writeFile', path, content) as Promise<void>,
+  listDirTree: (rootPath: string, pathPrefix: string) =>
+    ipcRenderer.invoke('fs:listDirTree', rootPath, pathPrefix) as Promise<Array<{
+      name: string; path: string; isDir: boolean
+      children?: Array<{ name: string; path: string; isDir: boolean; children?: unknown[] }>
+    }>>,
+  mkdirp: (path: string) => ipcRenderer.invoke('fs:mkdirp', path) as Promise<void>,
+  renamePath: (oldPath: string, newPath: string) => ipcRenderer.invoke('fs:rename', oldPath, newPath) as Promise<void>,
+  deletePath: (path: string) => ipcRenderer.invoke('fs:deletePath', path) as Promise<void>,
+  copyPath: (src: string, dest: string) => ipcRenderer.invoke('fs:copyPath', src, dest) as Promise<void>,
+  pathExists: (path: string) => ipcRenderer.invoke('fs:exists', path) as Promise<boolean>,
+  openPath: (path: string) => ipcRenderer.invoke('shell:openPath', path) as Promise<string>,
 
   // LaTeX
   onCompileLog: (cb: (log: string) => void) => {