fix: handle parsePatch errors in TUI to prevent crashes

Wrap parsePatch calls in try-catch blocks to gracefully handle malformed
diffs that can occur when undoing after tool_use/tool_result errors or
cancelled prompts. Prevents TUI from crashing with 'Added line count did not
match for hunk' error.

Fixes #3700

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -480,6 +480,7 @@ export function Session() {
       const diffText = s.revert?.diff || ""
       if (!diffText) return []
 
+      try {
         const patches = parsePatch(diffText)
         return patches.map((patch) => {
           const filename = patch.newFileName || patch.oldFileName || "unknown"
@@ -496,6 +497,9 @@ export function Session() {
             ),
           }
         })
+      } catch (error) {
+        return []
+      }
     })()
 
     return {
@@ -1245,6 +1249,8 @@ ToolRegistry.register<typeof EditTool>({
     const diff = createMemo(() => {
       const diff = props.metadata.diff ?? props.permission["diff"]
       if (!diff) return null
+
+      try {
         const patches = parsePatch(diff)
         if (patches.length === 0) return null
 
@@ -1298,6 +1304,9 @@ ToolRegistry.register<typeof EditTool>({
           oldContent: oldLines.join("\n"),
           newContent: newLines.join("\n"),
         }
+      } catch (error) {
+        return null
+      }
     })
 
     const code = createMemo(() => {