feat(app): OpenFX UI wiring - effect library, inspector params, startup glue

- src/oakui/ofx.rs: startup sequence (host scan, register_plugin_nodes,
  progress reporter factory -> app progress dialog channel, active
  viewer time provider, project extent sync); all failures degrade to
  logs. oak-worker runtime also scans and registers plugins.
- Effect library groups OpenFX entries by sub-category (Filter/
  Generator/Transition/General); effect insertion goes through
  Factory::create_any so dynamic plugin nodes resolve.
- Inspector renders OFX parameters from node inputs (sliders, combo
  boxes from repeated combo_option/combo_value properties, vec/color
  spinboxes, text with explicit commit, push buttons), edits are
  undoable; persistent plugin messages surface as a card badge.
- oakplugin: push_button_clicked and per-instance persistent message
  counting (thin public layers).

crates/oak-worker/src/worker.rs

@@ -235,6 +235,19 @@ impl WorkerSession {
 		// executor slot.
 		log_error("runtime: installing oakplugin render executor");
 		oakplugin::node_factory::install_render_executor();
+		// M15 S2: graphs carrying OFX plugin nodes deserialize/evaluate in
+		// the worker too, so the per-process node factory must register the
+		// discovered plugins exactly like the main process. A failed scan is
+		// non-fatal: the worker stays up for plugin-free graphs.
+		log_error("runtime: scanning and registering OFX plugins");
+		if let Err(e) = oakplugin::host::Host::global().cache.scan() {
+			log_error(&format!("runtime: OFX plugin scan failed ({e}); continuing"));
+		}
+		let registered = oakplugin::node_factory::register_plugin_nodes();
+		log_error(&format!(
+			"runtime: registered {} OFX plugin node type(s)",
+			registered.len()
+		));
 		log_error(
 			"runtime: config / frame manager / disk manager / project \
 			 serializer have no Rust backing in the worker binary; skipped",