feat(app): persist review state per session (#35488)

packages/app/src/context/layout.tsx

@@ -59,6 +59,8 @@ export function getProjectAvatarVariant(key?: string): ProjectAvatarVariant {
 type SessionView = {
   scroll: Record<string, SessionScroll>
   reviewOpen?: string[]
+  reviewMode?: ReviewChangeMode
+  reviewFile?: string
   pendingMessage?: string
   pendingMessageAt?: number
   todoCollapsed?: boolean
@@ -75,6 +77,7 @@ export type LocalProject = Partial<Project> & { worktree: string; expanded: bool
 export type HomeProjectSelection = { server: ServerConnection.Key; directory?: string }
 
 export type ReviewDiffStyle = "unified" | "split"
+export type ReviewChangeMode = "git" | "branch" | "turn"
 export type ReviewPanelSource = "context-button" | "other"
 
 export type LayoutRoute =
@@ -786,6 +789,14 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
       view(sessionKey: string | Accessor<string>) {
         const key = createSessionKeyReader(sessionKey, ensureKey)
         const s = createMemo(() => store.sessionView[key()] ?? { scroll: {} })
+        const reviewMode = createMemo(() => {
+          const mode = s().reviewMode
+          if (mode === "git" || mode === "branch" || mode === "turn") return mode
+        })
+        const reviewFile = createMemo(() => {
+          const file = s().reviewFile
+          if (typeof file === "string") return file
+        })
         const terminalOpened = createMemo(() => store.terminal?.opened ?? false)
         const reviewPanelOpened = createMemo(() => store.review?.panelOpened ?? DEFAULT_REVIEW_PANEL_OPENED)
         const reviewPanelSource = createMemo(() => (reviewPanelOpened() ? ephemeral.reviewPanelSource : "other"))
@@ -869,6 +880,32 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
             },
           },
           review: {
+            mode: reviewMode,
+            setMode(mode: ReviewChangeMode) {
+              const session = key()
+              const current = store.sessionView[session]
+              if (!current) {
+                setStore("sessionView", session, { scroll: {}, reviewMode: mode })
+                prune(session)
+                return
+              }
+              if (current.reviewMode === mode) return
+              setStore("sessionView", session, "reviewMode", mode)
+              prune(session)
+            },
+            file: reviewFile,
+            setFile(file: string) {
+              const session = key()
+              const current = store.sessionView[session]
+              if (!current) {
+                setStore("sessionView", session, { scroll: {}, reviewFile: file })
+                prune(session)
+                return
+              }
+              if (current.reviewFile === file) return
+              setStore("sessionView", session, "reviewFile", file)
+              prune(session)
+            },
             open: createMemo(() => s().reviewOpen ?? []),
             setOpen(open: string[]) {
               const session = key()