fix(session): accept legacy summary diffs (#26579)

Co-authored-by: Developer <temp@example.com>

packages/opencode/src/cli/cmd/export.ts

@@ -23,10 +23,10 @@ function span(id: string, value: { value: string; start: number; end: number })
   }
 }
 
-function diff(kind: string, diffs: { file: string; patch?: string }[] | undefined) {
+function diff(kind: string, diffs: { file?: string; patch?: string }[] | undefined) {
   return diffs?.map((item, i) => ({
     ...item,
-    file: redact(`${kind}-file`, String(i), item.file),
+    file: item.file === undefined ? undefined : redact(`${kind}-file`, String(i), item.file),
     patch: item.patch === undefined ? undefined : redact(`${kind}-patch`, String(i), item.patch),
   }))
 }

packages/opencode/src/cli/cmd/tui/plugin/api.tsx

@@ -148,7 +148,9 @@ function stateApi(sync: ReturnType<typeof useSync>): TuiPluginApi["state"] {
         return sync.data.session.length
       },
       diff(sessionID) {
-        return sync.data.session_diff[sessionID] ?? []
+        return (sync.data.session_diff[sessionID] ?? []).flatMap((item) =>
+          item.file === undefined ? [] : [{ ...item, file: item.file }],
+        )
       },
       todo(sessionID) {
         return sync.data.todo[sessionID] ?? []

packages/opencode/src/session/summary.ts

@@ -134,6 +134,7 @@ export const layer = Layer.effect(
         .read<Snapshot.FileDiff[]>(["session_diff", input.sessionID])
         .pipe(Effect.catch(() => Effect.succeed([] as Snapshot.FileDiff[])))
       const next = diffs.map((item) => {
+        if (item.file === undefined) return item
         const file = unquoteGitPath(item.file)
         if (file === item.file) return item
         return { ...item, file }

packages/opencode/src/snapshot/index.ts

@@ -20,10 +20,10 @@ export const Patch = Schema.Struct({
 export type Patch = typeof Patch.Type
 
 export const FileDiff = Schema.Struct({
-  file: Schema.String,
   // Optional because legacy/imported `summary_diffs` on disk may omit
-  // the patch text (see #26574). Required-Schema rejected the whole
-  // /session/<id>/diff response and broke session loading on Desktop.
+  // file details and patch text. Required Schema rejected the whole
+  // session response and broke session loading on Desktop.
+  file: Schema.optional(Schema.String),
   patch: Schema.optional(Schema.String),
   additions: NonNegativeInt,
   deletions: NonNegativeInt,