refactor: update TogglePanelAndFocus to use open/focused flags

Update TogglePanelAndFocus and related components to use open/focused flags.

Changed TogglePanelAndFocus from currently_open to open+focused flags.
Parser accepts optional [open] [focused] arguments.

Interactive mode toggles between open+focus and closed/unfocused.

Keymap updates: F/C/V in panel modes close panels when focused.

Model initialization: Virtual categories _Index/_Dim default to None
axis, regular categories auto-assign Row/Column/Page.

App test context updated with visible_rows/visible_cols.

Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/Qwen3.5-35B-A3B-GGUF:Q5_K_M)

src/ui/app.rs

@@ -296,6 +296,8 @@ mod tests {
             col_count: 2,
             row_offset: 0,
             col_offset: 0,
+            visible_rows: 20,
+            visible_cols: 8,
         };
         crate::command::cmd::EnterAdvance { cursor }
     }