Fix TUI display formatting issues for better terminal compatibility

- Simplified header design from complex Unicode borders to fixed-width lines
- Streamlined status bar from multi-line bordered display to clean single-line format
- Fixed terminal width calculation dependencies that caused layout breaks
- Enhanced status display: "🤖 Model Provider • 💾 Session" format
- Improved features display with color-coded indicators (✓/✗)
- Removed problematic border calculations causing wrapping issues
- All display tests pass, maintains functionality while fixing visual problems

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

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

src/cli.rs

@@ -42,16 +42,19 @@ impl ChatCLI {
 
     pub async fn run(&mut self) -> Result<()> {
         self.display.print_header();
-        self.display
-            .print_info("Type your message and press Enter. Commands start with '/'.");
-        self.display.print_info("Type /help for help.");
-
+        
+        // Enhanced status bar with comprehensive information
         let provider = get_provider_for_model(&self.session.model);
         let display_name = get_display_name_for_model(&self.session.model);
-        self.display
-            .print_model_info(&display_name, provider.as_str());
-        self.display.print_session_info(&self.session.name);
-
+        let features = vec![
+            ("Web Search", self.session.enable_web_search),
+            ("Reasoning", self.session.enable_reasoning_summary),
+            ("Extended Thinking", self.session.enable_extended_thinking),
+        ];
+        
+        self.display.print_status_bar(&display_name, provider.as_str(), &self.session.name, &features);
+        
+        self.display.print_info("Type your message and press Enter. Commands start with '/' (try /help).");
         println!();
 
         loop {
@@ -68,7 +71,16 @@ impl ChatCLI {
                         }
                     } else {
                         if let Err(e) = self.handle_user_message(line).await {
-                            self.display.print_error(&format!("Error: {}", e));
+                            // Enhanced error display with context and suggestions
+                            let error_msg = format!("Error: {}", e);
+                            let context = Some("This error occurred while processing your message.");
+                            let suggestions = vec![
+                                "Check your API key configuration",
+                                "Verify your internet connection", 
+                                "Try switching to a different model with /model",
+                                "Use /help to see available commands"
+                            ];
+                            self.display.print_error_with_context(&error_msg, context, &suggestions);
                         }
                         println!(); // Add padding before next prompt
                     }
@@ -425,33 +437,18 @@ impl ChatCLI {
 
     async fn tools_manager(&mut self) -> Result<()> {
         loop {
-            // Show current tool status
-            self.display.print_info("Tool Management:");
-
-            let web_status = if self.session.enable_web_search {
-                "✓ enabled"
-            } else {
-                "✗ disabled"
-            };
-            let reasoning_status = if self.session.enable_reasoning_summary {
-                "✓ enabled"
-            } else {
-                "✗ disabled"
-            };
-            let extended_thinking_status = if self.session.enable_extended_thinking {
-                "✓ enabled"
-            } else {
-                "✗ disabled"
-            };
-
-            println!("  Web Search: {}", web_status);
-            println!("  Reasoning Summaries: {}", reasoning_status);
-            println!("  Reasoning Effort: {}", self.session.reasoning_effort);
-            println!("  Extended Thinking: {}", extended_thinking_status);
-            println!(
-                "  Thinking Budget: {} tokens",
-                self.session.thinking_budget_tokens
-            );
+            // Show current tool status using enhanced display
+            let features = vec![
+                ("Web Search", self.session.enable_web_search, Some("Search the web for up-to-date information")),
+                ("Reasoning Summaries", self.session.enable_reasoning_summary, Some("Show reasoning process summaries")),
+                ("Extended Thinking", self.session.enable_extended_thinking, Some("Enable deeper reasoning capabilities")),
+            ];
+            
+            self.display.print_feature_status(&features);
+            
+            // Additional status information
+            self.display.print_info(&format!("Reasoning Effort: {}", self.session.reasoning_effort));
+            self.display.print_info(&format!("Thinking Budget: {} tokens", self.session.thinking_budget_tokens));
 
             // Check model compatibility
             let model = self.session.model.clone();