fix(release): desktop Rust E0277 + jupyter wheel jlpm-in-pnpm

Two build bugs (16 other v1.9.31 assets shipped fine; these were the last two):
- desktop: register_hotkey returned tauri::Result, but global_shortcut register()
  yields global_shortcut::Error with no From into tauri::Error (E0277). Return
  Box<dyn Error> — both ? sites convert, and setup() already expects it.
- jupyter: hatch-jupyter-builder ran 'jlpm install' (yarn) at the pnpm monorepo
  root → rejected. Build the prod labextension via pnpm first (creates the
  skip-if-exists target), so the wheel build never invokes jlpm.

.github/workflows/publish.yml

@@ -579,17 +579,24 @@ jobs:
       continue-on-error: true
       run: python -m pip install --upgrade jupyterlab build
 
-    - name: Build labextension
+    # Build the PROD labextension via pnpm (NOT jlpm). jlpm is yarn, which refuses to
+    # `install` inside this pnpm monorepo ("not part of the project"). Running the
+    # scripts through pnpm uses the already-installed node_modules and produces
+    # hanzo_jupyter/labextension/static/style.js — the hook's skip-if-exists target,
+    # so the wheel build below skips jlpm entirely.
+    - name: Build labextension (prod, via pnpm)
       continue-on-error: true
-      run: pnpm --filter @hanzo/jupyter build
+      run: |
+        pnpm --filter @hanzo/jupyter run build:lib:prod
+        pnpm --filter @hanzo/jupyter run build:labextension
 
     - name: Build wheel
       continue-on-error: true
       working-directory: packages/jupyter
       run: |
         VERSION=${GITHUB_REF_NAME#v}
-        # hatch-jupyter-builder runs `jlpm build:prod` during the wheel build; the
-        # pre-built labextension above satisfies its skip-if-exists check.
+        # skip-if-exists (hanzo_jupyter/labextension/static/style.js) is satisfied by
+        # the prod labextension above, so hatch-jupyter-builder does NOT invoke jlpm.
         python -m build --wheel
         mkdir -p /tmp/jupyter
         WHL=$(ls dist/hanzo_jupyter-*.whl dist/hanzo_ai_jupyter-*.whl 2>/dev/null | head -1)

packages/desktop/src-tauri/src/lib.rs

@@ -157,8 +157,11 @@ fn build_tray(app: &tauri::App) -> tauri::Result<()> {
 // register_hotkey wires the global Cmd/Ctrl+Shift+Space to toggle_window. The
 // plugin's handler fires on every registered shortcut; we match ours and act only
 // on Pressed (not Released) so one keypress is one toggle.
+// Returns Box<dyn Error> (not tauri::Result) because the global-shortcut plugin's
+// register() yields a tauri_plugin_global_shortcut::Error that has no From impl into
+// tauri::Error — both convert to Box<dyn Error>, which is what setup() expects anyway.
 #[cfg(desktop)]
-fn register_hotkey(app: &tauri::App) -> tauri::Result<()> {
+fn register_hotkey(app: &tauri::App) -> Result<(), Box<dyn std::error::Error>> {
     use tauri_plugin_global_shortcut::{Code, GlobalShortcutExt, Modifiers, Shortcut, ShortcutState};
 
     // Cmd+Shift+Space on macOS, Ctrl+Shift+Space elsewhere — the modifier the