Auto-meshing & Visualization Improvements

• Normalized member force diagrams across the entire model for visual clarity.
• Made mesh auto-regeneration smarter and more efficient, targeting only meshes that have been altered since the last run.
• Added ShearWall mesh auto-regeneration. Whenever a model is solved any old or outdated ShearWall meshes are automatically removed and replaced by a rebuild.
• Optimized auto-calculated annotation sizing: The new automatic annotation size calculation feature now uses vectorized NumPy operations and caching for efficient rendering of large models with hundreds or thousands of elements.
• Adjusted member diagram label offsets for clarity.