Network details QR code (#113)

Using QRCode library from pio to generate the QR code.

Done:
- Display QR code for URL in network mode
- minor fixes of layout
- Display QR for URL in AP mode
- Display QR for AP in AP mode

---------

Co-authored-by: Dave Allie <dave@daveallie.com>

.github/workflows/ci.yml

@@ -12,12 +12,6 @@ jobs:
       - uses: actions/checkout@v6
         with:
           submodules: recursive
-      - uses: actions/cache@v5
-        with:
-          path: |
-            ~/.cache/pip
-            ~/.platformio/.cache
-          key: ${{ runner.os }}-pio
       - uses: actions/setup-python@v6
         with:
           python-version: '3.14'