Changelog

The block type picker's InsertBlockType() switch statement had no

cases for columns_2, columns_3, or columns_2_wide_left. Selecting

any column layout from the "/" palette or Add Block button silently

did nothing.

Fix: add AddColumnsBlock relay command to NotesViewModel that

delegates to the existing CreateBlockFromTypeId() (which already

handles all three column variants). Wire the three column type IDs

in the picker's switch statement to call the new command.

Cover image action buttons (Change/Reposition/Remove) were positioned

at top-right with Margin="0,44,12,0", placing them directly under the

ToolbarHoverZone (ZIndex=1, Height=120 when cover exists). The hover

zone captured all pointer events before they reached the buttons.

Fix: move buttons to bottom-right of the cover (VerticalAlignment=

Bottom, Margin="0,0,12,28") and set ZIndex=2 so they float above the

toolbar hover zone. Buttons now appear on cover hover and are fully

clickable.

Replace ~95 lines of inline resize code (fields, 4 handlers,

ApplyDetailPanelRatio, FindControl lookups) with the shared

SplitPaneLayout control from UI.Adaptive. The code-behind now

has a single OnDetailPanelRatioChanged event handler for

persistence.

Also adds IsFinite guard in SetDetailPanelRatio to prevent

JSON serialization crash when ratio computes to Infinity.

The split grid uses a * column for the left pane, but the grid's

own Bounds.Width gets inflated by content desired size, preventing

the left pane from shrinking properly. Fixed by reading available

width from the parent Panel (which truly fills available space)

instead of from the grid itself. Both ApplyDetailPanelRatio and

drag resize now use parent width for calculations.

Also added left margin on the left pane so items don't touch the

edge.

When ShowingTrash toggles, the TreeView becomes invisible. Avalonia

tears down TreeViewItem containers and resets IsExpanded to false via

the two-way binding, collapsing all nodes. When returning from trash,

wiki folders (and any expanded regular folders) appeared empty because

their expansion state was lost.

Fix: snapshot _expandedNodeIds when entering trash, then restore

expansion state on all nodes (including wiki folders) when leaving.

Wiki folders with children are always re-expanded by convention since

they don't participate in the _expandedNodeIds tracking.