feat(notifications): include diff preview in fast apply notifications

Add formatted diff output to TUI notifications when fast apply completes.
This provides immediate visual feedback of the changes applied without
requiring users to check the file separately.

- Add formatDiffForMarkdown helper to wrap diffs in markdown code blocks
- Pass diff content through to sendTUINotification function
- Update notification message format to include diff preview
- Bump version to 2.2.1

Author: tickernelz

index.ts

@@ -228,6 +228,10 @@ function estimateTokens(text: string): number {
   return Math.ceil(text.length / 4)
 }
 
+function formatDiffForMarkdown(diff: string): string {
+  return "```diff\n" + diff + "\n```"
+}
+
 function normalizeWhitespace(text: string): string {
   return text
     .split('\n')
@@ -505,6 +509,7 @@ async function sendTUINotification(
   insertions: number,
   deletions: number,
   modifiedTokens: number,
+  diff: string,
   params: SessionParams
 ): Promise<void> {
   const shortPath = shortenPath(filePath, workingDir)
@@ -513,8 +518,9 @@ async function sendTUINotification(
   const message = [
     `▣ Fast Apply | ~${tokenStr} tokens modified`,
     "",
-    "Applied changes:",
-    `→ ${shortPath}: +${insertions} -${deletions}`
+    `Applied changes to ${shortPath} (+${insertions} -${deletions}):`,
+    "",
+    formatDiffForMarkdown(diff)
   ].join("\n")
 
   await sendTUIMessage(client, sessionID, message, params)
@@ -703,6 +709,7 @@ write({
             added,
             removed,
             modifiedTokens,
+            diff,
             params
           )
 

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "opencode-fast-apply",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "OpenCode plugin for Fast Apply - High-performance code editing with OpenAI-compatible APIs (LM Studio, Ollama)",
   "type": "module",
   "main": "dist/index.js",