ui/map-renderer: pin synthetic moved-event type to a real literal

`MovedEvent.type` in pixi-viewport@6 is a closed union of built-in
plugin names; the prior `"manual"` value tripped svelte-check.
`"animate"` is the closest semantic match for a programmatic move
and the renderer's listeners read only `viewport`.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/frontend/src/routes/__debug/map/+page.svelte

@@ -91,9 +91,13 @@
 					// (and any future per-move callback) sees the
 					// change — matches the semantics of a user drag.
 					handle.viewport.moveCenter(cx, cy);
+					// `MovedEvent.type` is a closed literal union over the
+					// built-in plugin names; `"animate"` is the closest
+					// match for a programmatic move and the renderer's
+					// listeners read only `viewport`.
 					handle.viewport.emit("moved", {
 						viewport: handle.viewport,
-						type: "manual",
+						type: "animate",
 					});
 				},
 				getViewport: () =>