fix(ui): improve editor and asset layouts

[perber]

Tighten the asset manager dialog and make asset rows wrap cleanly on smaller screens. Repair the tree view action trigger so its dropdown menu opens reliably again. Adjust the editor title bar spacing to improve mobile alignment without changing the surrounding header structure.

[Copilot]

Pull request overview

This PR refines several UI layouts to behave better on smaller screens and fixes an interaction regression in the tree view actions dropdown by making the action button compatible with “asChild”/ref-driven triggers.

Changes:

• Update Asset Manager list item layout to wrap actions cleanly on small screens and tighten the dialog width.
• Adjust editor title bar spacing/alignment for improved mobile layout.
• Refactor TreeViewActionButton to forwardRef and accept native button props for better integration with dropdown triggers.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
ui/leafwiki-ui/src/index.css	Updates Tailwind @apply rules for asset rows, asset manager dialog sizing, and editor title bar spacing.
ui/leafwiki-ui/src/features/tree/TreeViewActionButton.tsx	Converts to a forwardRef button that spreads native props (used by dropdown triggers).
ui/leafwiki-ui/src/features/assets/AssetItem.tsx	Wraps action buttons in a dedicated container and tweaks flex constraints for better wrapping/truncation.

Comments suppressed due to low confidence (1)

ui/leafwiki-ui/src/features/tree/TreeViewActionButton.tsx:30

• TreeViewActionButton spreads ...props onto the <button> but then overwrites className with a constant. When used with DropdownMenuTrigger asChild (or any consumer passing className), this drops the caller-provided classes and can break styling/behavior that relies on them.

        <button
          {...props}
          ref={ref}
          type={type}
          onClick={(e) => {
            onClick?.(e)
            e.stopPropagation()
          }}
          className="btn-treeview"
          aria-label={tooltip}
          data-testid={`tree-view-action-button-${actionName}`}

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