style(engine): clear latent android-only clippy warnings in hud_plugin

These six warnings only surfaced on an `aarch64-linux-android` clippy build;
the host workspace gate never compiles the `cfg(target_os = "android")` HUD
tap-toggle code, so they had accumulated unseen.

- unqualify `Vec2` / `TouchInput` (reachable via the bevy prelude) in the
  android tap tracker, plugin wiring, and `toggle_hud_on_tap` signature
- make the `PausedResource` import unconditional and unqualify its use in
  `handle_hint_button` (host-compiled, so the import had been android-gated
  purely to satisfy `toggle_hud_on_tap`)
- allow `clippy::too_many_arguments` on the `toggle_hud_on_tap` Bevy system
- collapse a nested `if let` / `if` into a let-chain

Verified clean on both host `clippy -p solitaire_engine --all-targets
-- -D warnings` and `aarch64-linux-android` clippy.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

solitaire_engine/src/hud_plugin.rs

@@ -36,7 +36,6 @@ use crate::game_plugin::GameMutation;
 use crate::input_plugin::TouchDragSet;
 use crate::layout::HUD_BAND_HEIGHT;
 use crate::layout::LayoutSystem;
-#[cfg(target_os = "android")]
 use crate::pause_plugin::PausedResource;
 use crate::platform::{SHOW_KEYBOARD_ACCELERATORS, USE_TOUCH_UI_LAYOUT};
 use crate::progress_plugin::ProgressResource;
@@ -174,7 +173,7 @@ pub enum HudVisibility {
 #[cfg(target_os = "android")]
 #[derive(Resource, Debug, Default)]
 struct HudTapTracker {
-    start_pos: Option<bevy::math::Vec2>,
+    start_pos: Option<Vec2>,
     /// Set `true` when the finger-down hit an action button so the
     /// finger-up never toggles bar visibility.
     started_on_button: bool,
@@ -529,7 +528,7 @@ impl Plugin for HudPlugin {
         #[cfg(target_os = "android")]
         {
             app.init_resource::<HudTapTracker>()
-                .add_message::<bevy::input::touch::TouchInput>()
+                .add_message::<TouchInput>()
                 .add_systems(
                     Update,
                     toggle_hud_on_tap
@@ -1140,7 +1139,7 @@ fn handle_help_button(
 
 fn handle_hint_button(
     interaction_query: Query<&Interaction, (With<HintButton>, Changed<Interaction>)>,
-    paused: Option<Res<crate::PausedResource>>,
+    paused: Option<Res<PausedResource>>,
     game: Option<Res<GameStateResource>>,
     solver_config: Option<Res<crate::input_plugin::HintSolverConfig>>,
     mut pending_hint: Option<ResMut<crate::pending_hint::PendingHintTask>>,
@@ -2658,8 +2657,9 @@ fn resize_action_bar_labels(
 }
 
 #[cfg(target_os = "android")]
+#[allow(clippy::too_many_arguments)]
 fn toggle_hud_on_tap(
-    mut touch_events: MessageReader<bevy::input::touch::TouchInput>,
+    mut touch_events: MessageReader<TouchInput>,
     drag: Res<DragState>,
     scrims: Query<(), With<ModalScrim>>,
     paused: Option<Res<PausedResource>>,
@@ -2697,13 +2697,14 @@ fn toggle_hud_on_tap(
                 // regardless of whether we toggle.
                 let on_button = tracker.started_on_button || game_consumed.0;
                 game_consumed.0 = false;
-                if let Some(start) = tracker.start_pos.take() {
-                    if !on_button && (event.position - start).length() < HUD_TAP_SLOP_PX {
-                        *hud_vis = match *hud_vis {
-                            HudVisibility::Visible => HudVisibility::Hidden,
-                            HudVisibility::Hidden => HudVisibility::Visible,
-                        };
-                    }
+                if let Some(start) = tracker.start_pos.take()
+                    && !on_button
+                    && (event.position - start).length() < HUD_TAP_SLOP_PX
+                {
+                    *hud_vis = match *hud_vis {
+                        HudVisibility::Visible => HudVisibility::Hidden,
+                        HudVisibility::Hidden => HudVisibility::Visible,
+                    };
                 }
                 tracker.started_on_button = false;
             }