chore: bump VERSION_NAME_BASE to 2.8.0 for release

Opening commit for the release/2.8.0 stabilization branch. versionCode
remains git-derived (offset 29314197 + commit count); only the base
version name is bumped here. CI overrides this with the release tag.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jamesarich

config.properties

@@ -27,7 +27,7 @@ COMPILE_SDK=37
 # Base version name for local development and fallback
 # On CI, this is overridden by the Git tag
 # Before a release, update this to the new Git tag version
-VERSION_NAME_BASE=2.7.14
+VERSION_NAME_BASE=2.8.0
 
 # Minimum firmware versions supported by this app
 MIN_FW_VERSION=2.5.14