Fix version, title, and description not applied during build

[Copilot]

build.yml passed no version metadata to msbuild, and AssemblyInfo.cs files had hardcoded, stale versions that were out of sync with the csproj formulas ($(RevitVersion).4.1 for RhythmRevit, $(RevitVersion).1.1 for RhythmCore). R27 was missing entirely from RhythmRevit's AssemblyInfo, and R26/R27 from RhythmCore's.

Changes

• build.yml: Added a version extraction step that reads the version suffix dynamically from each csproj. All 16 msbuild invocations now explicitly pass /p:Version, /p:AssemblyVersion, /p:FileVersion, /p:Title, /p:Description, and /p:Product:

  - name: Extract version information from project files
    run: |
      $revitVersionSuffix = ...  # parsed from "$(RevitVersion).4.1"
      echo "REVIT_VERSION_SUFFIX=$revitVersionSuffix" >> $env:GITHUB_ENV
  
  - name: Build RhythmRevit - Release R20
    run: |
      msbuild ... /p:Version="2020.$env:REVIT_VERSION_SUFFIX" \
                  /p:AssemblyVersion="2020.$env:REVIT_VERSION_SUFFIX" \
                  /p:Title="Rhythm for Dynamo|Revit2020" ...

• RhythmRevit/Properties/AssemblyInfo.cs: Replaced hardcoded "2025.7.1" with per-config #if/#elif chain covering R20–R27 (matching csproj formula). Consolidated AssemblyVersion, AssemblyFileVersion, AssemblyTitle, AssemblyProduct, and AssemblyDescription into each block. Added missing R27 entry.

• RhythmCore/Properties/AssemblyInfo.cs: Same treatment — replaced hardcoded "2024.10.1" with R20–R27 blocks matching $(RevitVersion).1.1. Added missing R26 and R27 entries.