67041dd4a5
Add view navigation history with back/forward stacks (bound to < and >). Introduce CategoryKind enum to distinguish regular categories from virtual ones (_Index, _Dim) that are synthesized at query time. Add DrillIntoCell command that creates a drill view showing raw data for an aggregated cell, expanding categories on Axis::None into Row and Column axes while filtering by the cell's fixed coordinates. Virtual categories default to Axis::None and are automatically added to all views when the model is initialized. Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/Qwen3.5-35B-A3B-GGUF:Q5_K_M)