feat: progressive build number in version field 4
Field 4 of VERSIONINFO becomes a committed, progressive build counter
that increments on every build, for granular build-to-build comparison.
Fields 1-3 (3.0.1) stay manual and remain the only part shown in About.
- version.h: semantic version (single source of truth) + counter include
- TaskbarCalculator.rc2: entire VS_VERSION_INFO, macro-driven, editor-safe
- TaskbarCalculator.rc: version block removed, .rc2 wired via TEXTINCLUDE 3
and the #ifndef APSTUDIO_INVOKED region
- TaskbarCalculator.vcxproj: IncrementBuildCounter target (pre-ResourceCompile)
- BuildCounter.txt: committed counter (seed 1); version_build.h generated + gitignored
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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