TimelineView emits ContextMenuRequested with hit target (clip/empty/
track head/ruler marker), NodeGraphView emits it for nodes and the
background, and ProjectExplorer emits it for entries and blank areas,
so the app can open context menus aligned with the C++ version.
- node_graph: card geometry stays graph-space; paint/hit-test/wire
endpoints scale by zoom so nodes no longer overlap at zoom != 1
- project_explorer: icon grid aligns items to start (no full-height
selection stretch), loads thumbnails from filesystem paths and
observes the data source for late arrivals
- gpui::i18n: minimal string-table override (set_table/tr/clear_table) with
built-in defaults; effect-stack and viewer strings now go through it so
hosts can localize widget-baked labels without a full i18n framework.
- gpui_widgets::i18n re-exports the hook (gpui_widgets::i18n::set_table).
- node_graph: GraphViewState::fit_to_rect for fit-window/initial viewports
(unit tested); NodeGraphView::viewport_size accessor for fit targets.
Mike-Solar