v0.07: switch to Chromium snap, remove Google Chrome

- Replace google-chrome with /snap/bin/chromium
- Remove --test-type flag (was triggering Google bot detection/CAPTCHA)
- Add --disable-blink-features=AutomationControlled (hides webdriver flag)
- Move profile dir to /home/jgitta/chromium-kiosk (snap can't write to .config)
- Uninstall google-chrome-stable and its apt repo

browser.py

@@ -561,7 +561,7 @@ class KioskOverlay(QWidget):
 # ── Chrome launcher ───────────────────────────────────────────────
 def launch_chrome():
     import pathlib, json as _json, shutil
-    profile_dir = pathlib.Path("/home/jgitta/.config/google-chrome-kiosk")
+    profile_dir = pathlib.Path("/home/jgitta/chromium-kiosk")
     profile_dir.mkdir(parents=True, exist_ok=True)
 
     for name in ("SingletonLock", "SingletonSocket", "SingletonCookie"):
@@ -606,7 +606,7 @@ def launch_chrome():
 
     chrome_h = SCREEN_H - TOP_H
     cmd = [
-        "google-chrome",
+        "chromium",
         "--no-first-run",
         "--no-default-browser-check",
         "--disable-translate",
@@ -623,9 +623,9 @@ def launch_chrome():
         "--disable-extensions",
         "--disable-gpu",
         "--no-sandbox",
-        "--test-type",
+        "--disable-blink-features=AutomationControlled",
         "--disable-dev-shm-usage",
-        "--user-data-dir=/home/jgitta/.config/google-chrome-kiosk",
+        "--user-data-dir=/home/jgitta/chromium-kiosk",
         f"--remote-debugging-port={CDP_PORT}",
         "--remote-allow-origins=*",
         f"--window-position=0,{TOP_H}",