* Add animated sidebar toggle and splitter APIs
Add an animated, persistent sidebar toggle and supporting splitter APIs/UI.
- New icon resource: studio/desktop/resources/icons/icon_sidebar_toggle.svg
- UI: replace hidden caption bar with a visible caption that includes a sidebar toggle button (CaptionSidebarToggle), layout adjustments and related controls.
- App behavior: add SidebarAnimation struct and App fields to track animation state and next-frame. Handle button actions, next-frame stepping, and window drag queries to avoid initiating window drag over the toggle.
- Add App methods to query/set the workspace root splitter position, start/step sidebar animations, toggle sidebar (remember/restore width), and sync tab-bar visibility for mounts.
- Persist mount sidebar restore width by adding sidebar_restore_width to MountState and initializing default.
- Make save_state pub(super) so App can save when animation finishes.
- Widgets: expose splitter position and set_splitter_align on Dock and Splitter to allow programmatic width changes and redrawing.
These changes improve UX by providing a smooth animated sidebar hide/show, remembering user width per mount, and ensuring the dock UI updates correctly during mount/tab changes.
* Persist sidebar_restore_width in mount state
Add an Option<f64> sidebar_restore_width to PersistedMountStateRon and wire it through loading and collection so the sidebar width is saved and restored. Include tests to verify a round-trip serialization/deserialization preserves the value and that missing legacy data defaults to None for backward compatibility.
* Sync run preview splitter state
Hide and restore the Run preview column based on whether run tabs exist. Added run_panel_split_restore to AppData to remember the last editor_split ratio per mount, plus a helper (run_preview_splitter_is_collapsed) and a new method sync_run_preview_splitter that collapses the preview when there are no runs and restores the previous ratio when runs reappear (defaults to Weighted(0.62)). Called sync_run_preview_splitter from relevant places: after creating/ensuring run tabs, when clearing build tabs, when closing run tabs, and at startup to initialize each mount. Also added /.cocoindex_code/ to .gitignore.
* Add bottom panel toggle with animation
Introduce a bottom panel toggle UI and animation support. Adds a new icon resource and CaptionPanelToggle button in the caption bar, moves/adjusts caption layout, and wires the button to toggle the bottom panel. Adds a TerminalShellPane, bottom_terminal_tab, and integrates bottom_panel_tabs into the workspace layout. Implements BottomPanelAnimation, animation helpers (panel_animation_progress, start/step logic), workspace splitter height getters/setters, and toggle/select helpers (toggle_bottom_panel, select_bottom_terminal_panel). Persists mount bottom_panel_restore_height in MountState and persisted state with tests updated. Also updates drag/tab behavior to account for the new bottom terminal tab and routes animation next-frame events.
* Refactor reflow_resize and add wrap test
Rewrite reflow_resize to simplify reflow logic and improve handling of growing/shrinking rows and scrollback. The change always captures the old grid state, builds logical (re-wrapped) scrollback lines, and then branches on whether the new height is greater, less, or equal to the old height. On growth it may pull rows from the logical scrollback when the terminal was full, preserve content when a custom scroll region is present, and correctly update cursor, high-water, saved cursor and bottom_trimmed_rows. On shrink it chooses how many bottom rows to push into scrollback based on cursor position, trimmed rows, and content below the cursor, and trims scrollback to max_scrollback. Also adjust cursor bounds and pending_wrap handling. Add a test (visible_wrapped_prompt_rows_do_not_reflow_on_width_growth) to ensure visible wrapped prompt rows do not get reflowed when the width increases.
