chore(deps): migrate to Bevy 0.16, axum 0.8, and other package updates

- Bump bevy 0.15 → 0.16; fixes all breaking API changes:
  ChildBuilder → ChildSpawnerCommands, Parent → ChildOf,
  despawn_descendants → despawn_related::<Children>(),
  despawn_recursive → despawn (now recursive by default),
  EventWriter::send → write, Query::{get_single,get_single_mut}
  → {single,single_mut}, ChildOf::get → parent()
- Bump axum 0.7 → 0.8; remove axum::async_trait from FromRequestParts
- Bump tower_governor 0.4 → 0.8; fix GovernorLayer::new() API
- Bump jsonwebtoken 9 → 10 with rust_crypto feature only
- Bump thiserror 1 → 2, dirs 5 → 6, bcrypt 0.15 → 0.19,
  reqwest 0.12 → 0.13 (rustls feature rename)
- Regenerate .sqlx offline cache for sqlx compile-time query checks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_engine/src/profile_plugin.rs

@@ -42,8 +42,8 @@ fn toggle_profile_screen(
     if !keys.just_pressed(KeyCode::KeyP) {
         return;
     }
-    if let Ok(entity) = screens.get_single() {
-        commands.entity(entity).despawn_recursive();
+    if let Ok(entity) = screens.single() {
+        commands.entity(entity).despawn();
     } else {
         spawn_profile_screen(
             &mut commands,
@@ -246,7 +246,7 @@ fn spawn_profile_screen(
 }
 
 /// Spawn a fixed-height vertical spacer node.
-fn spawn_spacer(parent: &mut ChildBuilder, height_px: f32) {
+fn spawn_spacer(parent: &mut ChildSpawnerCommands, height_px: f32) {
     parent.spawn(Node {
         height: Val::Px(height_px),
         ..default()