The version displayed in the sidebar was showing "vv3.5.0" instead of
"v3.5.0" because the APP_VERSION environment variable (often from Git
tags like "v3.5.0") already contained a "v" prefix, and the template
was adding another one.
Modified app/utils/context_processors.py to strip any leading 'v'
prefix from the version value before passing it to templates. This
ensures the template's "v{{ app_version }}" always displays correctly.
Fixes the sidebar version display issue in base.html line 269.