Module ui 

GTK/relm4 layer: the panel window, toolbar and file tree.

Layout of concerns:

• app — the root relm4::SimpleComponent: owns the layer-shell window, the toolbar and tree subcomponents, the status bar and session state persistence.
• bookmarks — the bookmarks strip docked above/below the panes, plus its editor dialog.
• toolbar — the “open folder” button and the editable path entry.
• tree — the file tree itself: rendering, keyboard navigation, the context menu, inline rename, clipboard and trash.
• props — the Properties dialog (metadata and a permissions editor).

Modules

app

The root component: hosts the panel as one or more dock windows — a left dock, a right dock, or both — each containing its own stack of split panes, and applies single-instance launch requests.

bookmarks

The bookmarks pane view and its editor dialog.

props

The Properties dialog.

toolbar

The panel toolbar: a hamburger menu button and an editable current-path entry that fills the remaining width.

tree

The file tree: rendering, keyboard navigation, context menu, inline rename, clipboard and trash.