fix(install): add --prefer-binary to pip installs to avoid /tmp exhaustion (#272)

timezonefinder (~54 MB) includes large timezone polygon data files that pip
unpacks into /tmp during installation. On Raspberry Pi, the default tmpfs
/tmp size (often ~half of RAM) can be too small, causing the install to fail
with an out-of-space error.

Adding --prefer-binary tells pip to prefer pre-built binary wheels over
source distributions. Since timezonefinder and most other packages publish
wheels on PyPI (and piwheels.org has ARM wheels), this avoids the large
temporary /tmp extraction and speeds up installs generally.

Co-authored-by: Chuck <chuck@example.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/install_dependencies_apt.py

@@ -52,7 +52,7 @@ def install_via_pip(package_name):
     try:
         print(f"Installing {package_name} via pip...")
         subprocess.check_call([
-            sys.executable, '-m', 'pip', 'install', '--break-system-packages', package_name
+            sys.executable, '-m', 'pip', 'install', '--break-system-packages', '--prefer-binary', package_name
         ])
         print(f"Successfully installed {package_name} via pip")
         return True