fix: resolve clippy warnings and formatting issues

- Simplify match patterns as suggested by clippy
- Use if let instead of match for single pattern matching
- Apply rustfmt formatting

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: unhappychoice

src/game/screens/result_screen.rs

@@ -481,11 +481,7 @@ impl ResultScreen {
         }
 
         // Display options
-        let options = [
-            "[S] Share Result",
-            "[T] Back to Title",
-            "[ESC] Quit",
-        ];
+        let options = ["[S] Share Result", "[T] Back to Title", "[ESC] Quit"];
 
         let options_start = if !stage_engines.is_empty() {
             let stage_results_start_row = summary_start_row + summary_lines.len() as u16 + 2;

src/game/stage_manager.rs

@@ -212,14 +212,9 @@ impl StageManager {
                     }
 
                     // Show brief result and auto-advance
-                    if let Some(action) = self.show_stage_completion(&metrics)? {
-                        match action {
-                            ResultAction::Quit => {
-                                // Treat as failed - show fail result screen and handle navigation
-                                return self.handle_fail_result_navigation();
-                            }
-                            _ => {}
-                        }
+                    if let Some(ResultAction::Quit) = self.show_stage_completion(&metrics)? {
+                        // Treat as failed - show fail result screen and handle navigation
+                        return self.handle_fail_result_navigation();
                     }
 
                     // Move to next stage
@@ -239,14 +234,9 @@ impl StageManager {
                         }
                     }
 
-                    if let Some(action) = self.show_stage_completion(&metrics)? {
-                        match action {
-                            ResultAction::Quit => {
-                                // Treat as failed - show fail result screen and handle navigation
-                                return self.handle_fail_result_navigation();
-                            }
-                            _ => {}
-                        }
+                    if let Some(ResultAction::Quit) = self.show_stage_completion(&metrics)? {
+                        // Treat as failed - show fail result screen and handle navigation
+                        return self.handle_fail_result_navigation();
                     }
 
                     // Generate a new challenge for the current stage