Update agent prompt, improve TUI patch UI, remove obsolete tool tests

- Replace and expand agent coder prompt for clarity and safety
- Add patch tool and TUI dialog support for patch diffs
- Sort sidebar modified files by name
- Remove Bash/Edit/Sourcegraph/Write tool tests

🤖 Generated with opencode
Co-Authored-By: opencode <noreply@opencode.ai>

main.go

@@ -6,11 +6,9 @@ import (
 )
 
 func main() {
-	// Set up panic recovery for the main function
 	defer logging.RecoverPanic("main", func() {
-		// Perform any necessary cleanup before exit
 		logging.ErrorPersist("Application terminated due to unhandled panic")
 	})
-	
+
 	cmd.Execute()
 }