refactor: improve NewUnifiedDiffStrategy with enhanced formatting and error handling

- Cleaned up formatting in the parseUnifiedDiff method to ensure consistent indentation and spacing.
- Updated documentation to clarify format requirements for generating unified diffs.
- Added error handling for cases where no hunks are found in the provided diff, improving robustness.
- Enhanced overall readability of the code by standardizing comments and structure.

src/core/diff/strategies/new-unified/index.ts

@@ -129,7 +129,7 @@ If you need to move code within a file, create two hunks: one to delete the code
 
 To create a new file, show a diff from "--- /dev/null" to "+++ path/to/new/file.ext".
 
-Here’s an example of the desired format:
+Format Requirements:
 
 \`\`\`diff
 --- mathweb/flask/app.py
@@ -171,6 +171,10 @@ Here’s an example of the desired format:
 
 Be precise, consistent, and follow these rules carefully to generate correct diffs!
 
+Parameters:
+- path: (required) The path of the file to apply the diff to (relative to the current working directory ${cwd})
+- diff: (required) The diff content in unified format to apply to the file.
+
 Usage:
 <apply_diff>
 <path>File path here</path>
@@ -191,6 +195,10 @@ Your diff here
 		const originalLines = originalContent.split("\n")
 		let result = [...originalLines]
 
+		if (!parsedDiff.hunks.length) {
+			return { success: false, error: "No hunks found in diff" }
+		}
+
 		for (const hunk of parsedDiff.hunks) {
 			const contextStr = prepareSearchString(hunk.changes)
 			const { index: matchPosition, confidence } = findBestMatch(contextStr, result)