ci: fix AppImage uv install and bump web Node to 22

First live run surfaced two failures:

- linux-appimage: `uv pip install --system` is rejected by uv's managed
  CPython (externally-managed). Install into a uv venv and prepend it to
  GITHUB_PATH so the later PyInstaller steps resolve it.
- wheel + ci web job: pnpm 11.5 requires Node >=22.13 and crashed on the
  node:sqlite builtin under Node 20. Bump both jobs to Node 22.

Author: Mnikley

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
           version: 11
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: pnpm
           cache-dependency-path: web/pnpm-lock.yaml
       - name: Install

.github/workflows/release.yml

@@ -59,7 +59,12 @@ jobs:
           enable-cache: true
 
       - name: Install project + PyInstaller
-        run: uv pip install --system . pyinstaller
+        # uv's managed CPython is externally-managed and rejects --system, so
+        # install into a venv and put it on PATH for the later build steps.
+        run: |
+          uv venv
+          uv pip install . pyinstaller
+          echo "$PWD/.venv/bin" >> "$GITHUB_PATH"
 
       # The Windows .spec uses backslash paths and a .ico icon, so the Linux
       # build drives PyInstaller via CLI flags instead.
@@ -124,7 +129,7 @@ jobs:
           version: 11
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: pnpm
           cache-dependency-path: web/pnpm-lock.yaml
       - name: Install uv