fix(ui): preserve original idle view and function keys

Remove the invented attract-screen instruction panel so idle mode presents the
original table artwork without a modern overlay. Keep the original plus-key
start flow and automatic high-score presentation.

Stop assigning F2 and F3 to modern screens; those keys are normally inactive in
the original executable outside dormant debug paths. Retain optional portable
settings and high-score viewers on F10 and F9, documenting them as additional
host controls rather than original behavior.

Test Plan:
- `cargo test --all-targets` -- passed, 70 tests
- `cargo clippy --all-targets -- -D warnings` -- passed
- `rumdl check CHANGELOG.md README.md RECONSTRUCTION.md` -- passed
- `git diff --cached --check` -- passed

tdkpin-rs/src/app.rs

@@ -125,7 +125,7 @@ impl App {
                 self.screen = Screen::Help;
             }
         }
-        if is_key_pressed(KeyCode::F2) && self.screen != Screen::NameEntry {
+        if is_key_pressed(KeyCode::F10) && self.screen != Screen::NameEntry {
             if self.screen == Screen::Settings {
                 self.screen = self.return_screen;
             } else {
@@ -133,7 +133,7 @@ impl App {
                 self.screen = Screen::Settings;
             }
         }
-        if is_key_pressed(KeyCode::F3) && self.screen != Screen::NameEntry {
+        if is_key_pressed(KeyCode::F9) && self.screen != Screen::NameEntry {
             if self.screen == Screen::HighScores {
                 self.screen = self.return_screen;
             } else {
@@ -352,24 +352,6 @@ impl App {
 
     fn draw_attract(&self) {
         draw_texture(&self.assets.inactive_table, 0.0, 0.0, WHITE);
-        draw_panel(342.0, 72.0, 267.0, 144.0);
-        draw_centered_at("TDK PINBALL MACHINE", 475.5, 107.0, 22, BLACK);
-        draw_centered_at(
-            "PRESS + TO START",
-            475.5,
-            139.0,
-            22,
-            Color::from_rgba(0, 72, 102, 255),
-        );
-        draw_centered_at("PRESS + AGAIN TO ADD PLAYERS", 475.5, 165.0, 15, BLACK);
-        draw_centered_at("THEN HOLD DOWN TO LAUNCH", 475.5, 196.0, 16, BLACK);
-        draw_text(
-            "F1 HELP   F2 SETTINGS   F3 HIGHSCORES   F12 SOUND",
-            322.0,
-            448.0,
-            10.0,
-            BLACK,
-        );
     }
 
     #[allow(clippy::cast_precision_loss, clippy::too_many_lines)]