fix: UI glitch: config is not visible

Co-authored-by: sunlit-deng <253064511+sunlit-deng@users.noreply.github.com>

ui/src/ui/views/config.browser.test.ts

@@ -473,6 +473,36 @@ describe("config view", () => {
     expect(content.scrollLeft).toBe(0);
   });
 
+  it("resets config content scroll when switching from form to raw mode", async () => {
+    const container = document.createElement("div");
+    document.body.append(container);
+
+    try {
+      const renderCase = (overrides: Partial<ConfigProps>) =>
+        render(renderConfig({ ...baseProps(), ...overrides }), container);
+
+      renderCase({ formMode: "form" });
+
+      const content = queryRequired(container, ".config-content", HTMLElement);
+      content.scrollTop = 320;
+      content.scrollLeft = 18;
+      content.scrollTo = vi.fn(({ top, left }: { top?: number; left?: number }) => {
+        content.scrollTop = top ?? content.scrollTop;
+        content.scrollLeft = left ?? content.scrollLeft;
+      }) as typeof content.scrollTo;
+
+      renderCase({ formMode: "raw" });
+      await Promise.resolve();
+
+      expect(content["scrollTo"]).toHaveBeenCalledOnce();
+      expect(content["scrollTo"]).toHaveBeenCalledWith({ top: 0, left: 0, behavior: "auto" });
+      expect(content.scrollTop).toBe(0);
+      expect(content.scrollLeft).toBe(0);
+    } finally {
+      container.remove();
+    }
+  });
+
   it("can hide the root tab for scoped settings surfaces", () => {
     const { container } = renderConfigView({
       activeSection: "channels",

ui/src/ui/views/config.ts

@@ -1184,6 +1184,7 @@ function createConfigEphemeralState(): ConfigEphemeralState {
 
 const cvs = createConfigEphemeralState();
 let lastConfigContextKey: string | null = null;
+let lastFormModeForScroll: ConfigProps["formMode"] | null = null;
 
 function resetConfigEphemeralState() {
   Object.assign(cvs, createConfigEphemeralState());
@@ -1222,6 +1223,7 @@ function toggleSensitivePathReveal(path: Array<string | number>) {
 export function resetConfigViewStateForTests() {
   resetConfigEphemeralState();
   lastConfigContextKey = null;
+  lastFormModeForScroll = null;
 }
 
 export function renderConfig(props: ConfigProps) {
@@ -1237,6 +1239,31 @@ export function renderConfig(props: ConfigProps) {
   const rawAvailable = props.rawAvailable ?? true;
   const formMode = showModeToggle && rawAvailable ? props.formMode : "form";
   const requestUpdate = props.onRequestUpdate ?? (() => {});
+  // Scroll helper: target-based (nav clicks) with global fallback (form/raw toggle)
+  const resetContentScroll = (target: EventTarget | null) => {
+    queueMicrotask(() => {
+      const origin = target instanceof Element ? target : null;
+      const content =
+        origin?.closest(".config-main")?.querySelector<HTMLElement>(".config-content") ??
+        globalThis.document?.querySelector<HTMLElement>(".config-content");
+      if (!content) {
+        return;
+      }
+      if (typeof content.scrollTo === "function") {
+        content.scrollTo({ top: 0, left: 0, behavior: "auto" });
+        return;
+      }
+      content.scrollTop = 0;
+      content.scrollLeft = 0;
+    });
+  };
+
+  // Reset scroll position when switching between form and raw mode
+  if (lastFormModeForScroll !== null && lastFormModeForScroll !== formMode) {
+    resetContentScroll(null);
+  }
+  lastFormModeForScroll = formMode;
+
   const currentContextKey = configContextKey(props);
   if (lastConfigContextKey !== currentContextKey) {
     resetConfigEphemeralState();
@@ -1301,24 +1328,6 @@ export function renderConfig(props: ConfigProps) {
   const settingsLayout = props.settingsLayout ?? "tabs";
   const allCategories = [...visibleCategories, ...(otherCategory ? [otherCategory] : [])];
 
-  const resetContentScroll = (target: EventTarget | null) => {
-    queueMicrotask(() => {
-      const origin = target instanceof Element ? target : null;
-      const content = origin
-        ?.closest(".config-main")
-        ?.querySelector<HTMLElement>(".config-content");
-      if (!content) {
-        return;
-      }
-      if (typeof content.scrollTo === "function") {
-        content.scrollTo({ top: 0, left: 0, behavior: "auto" });
-        return;
-      }
-      content.scrollTop = 0;
-      content.scrollLeft = 0;
-    });
-  };
-
   function renderAccordionNav() {
     return html`
       <div class="config-accordion-nav">