Polish round: node-delete chrome + rename alignment

Owner polish dispatch (2026-09-23):

- Right-click no longer pins a node or opens the detail card: the
  canvas pointerdown/up handlers now gate on the primary button, so
  the context menu arrives alone.
- Node context menu: label is just "Delete" and the shell hugs its
  content (w-44 -> w-fit); the menu body keeps focus for arrow
  cycling but never shows the browser's default focus ring
  (outline-none on the MenuShell body - applies to every menu).
- Delete confirm: "Delete node?" title in CMU Serif, red
  (text-destructive); the node name sits below in JetBrains Mono
  inline-code; the Delete button carries the destructive treatment
  (border + tint, fill deepens on hover). Rest of the dialog stays
  neutral.
- Sidebar rename row: text and metadata stay at the idle row's x -
  the status spacer and the input's border/padding are gone; the
  underline is the only editing cue.

components/graph-view.tsx

@@ -1241,7 +1241,7 @@ export function GraphView() {
 					anchorRef={ctxAnchorRef}
 					testid="node-context-menu"
 					preferredSide="down"
-					menuClass="flex w-44 flex-col gap-0.5 rounded-xl border bg-card p-2 text-xs shadow-xl"
+					menuClass="flex w-fit flex-col gap-0.5 rounded-xl border bg-card p-2 text-xs shadow-xl"
 				>
 					<button
 						type="button"
@@ -1252,7 +1252,7 @@ export function GraphView() {
 						}}
 						className="flex items-center rounded-lg px-2.5 py-1.5 text-left text-muted-foreground/80 transition-colors hover:bg-accent hover:text-foreground"
 					>
-						Delete…
+						Delete
 					</button>
 				</MenuShell>
 			)}