style(frontend): Prettier config + one-time repo-wide format pass

Prettier 3 (pinned), printWidth 100, double quotes — chosen to match the existing
hand-formatting and minimise reflow. This commit is ONLY the mechanical format pass
(`prettier --write`) plus the config/ignore/scripts, isolated so it never pollutes a
feature diff. Verified behaviour-neutral: typecheck, eslint (0 errors), and vitest
all green before and after. See .git-blame-ignore-revs — `git blame` skips this sha.

frontend/e2e/README.md

@@ -2,7 +2,7 @@
 
 Playwright tests that lock the app's five core flows — **feed** (scroll + filter), **channel**
 (open → back), **player** (open/close), **settings** (dirty-save + guard), and **page switching** —
-so the Platform refactor can *prove* it changed nothing. They assert current, correct behavior;
+so the Platform refactor can _prove_ it changed nothing. They assert current, correct behavior;
 they deliberately do **not** encode the known Platform bugs (those get their own specs when the
 sprints that fix them land).
 

frontend/e2e/channel.spec.ts

@@ -59,7 +59,9 @@ test.describe("channel view", () => {
   // Bug 2 (Platform S5): opening a channel no longer FORCES Live/Upcoming on — the channel view
   // seeds its content-type prefs (normal / shorts / live) from the global feed. Locked both ways so
   // a future refactor can't silently re-hardcode it.
-  test("the channel view inherits the feed's content filters (no forced Live/Upcoming)", async ({ page }) => {
+  test("the channel view inherits the feed's content filters (no forced Live/Upcoming)", async ({
+    page,
+  }) => {
     await openApp(page);
     await expect(page.getByTestId("video-card").first()).toBeVisible();
     const feedLive = page.getByTestId("feed-content-includeLive");
@@ -68,7 +70,10 @@ test.describe("channel view", () => {
     // Inherit OFF: the channel toolbar's Live/Upcoming stays off, not forced on.
     await page.getByTestId("video-card-channel").first().click();
     await expect(page.getByTestId("channel-title")).toBeVisible();
-    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute("aria-pressed", "false");
+    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute(
+      "aria-pressed",
+      "false",
+    );
     await page.getByTestId("channel-back").click();
     await expect(page.getByTestId("channel-title")).toHaveCount(0);
 
@@ -78,7 +83,10 @@ test.describe("channel view", () => {
     await expect(page.getByTestId("video-card").first()).toBeVisible();
     await page.getByTestId("video-card-channel").first().click();
     await expect(page.getByTestId("channel-title")).toBeVisible();
-    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute("aria-pressed", "true");
+    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute(
+      "aria-pressed",
+      "true",
+    );
   });
 
   // Bug 2 (Platform S5): the channel view is its OWN filter scope — a content toggle made there
@@ -87,18 +95,27 @@ test.describe("channel view", () => {
   test("a channel's content toggle does not leak into the feed", async ({ page }) => {
     await openApp(page);
     await expect(page.getByTestId("video-card").first()).toBeVisible();
-    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute("aria-pressed", "false");
+    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute(
+      "aria-pressed",
+      "false",
+    );
 
     // Turn Live/Upcoming ON inside the channel view.
     await page.getByTestId("video-card-channel").first().click();
     await expect(page.getByTestId("channel-title")).toBeVisible();
     await page.getByTestId("feed-content-includeLive").click();
-    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute("aria-pressed", "true");
+    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute(
+      "aria-pressed",
+      "true",
+    );
 
     // Back on the feed, its Live/Upcoming is still off — the channel's change stayed local.
     await page.getByTestId("channel-back").click();
     await expect(page.getByTestId("channel-title")).toHaveCount(0);
-    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute("aria-pressed", "false");
+    await expect(page.getByTestId("feed-content-includeLive")).toHaveAttribute(
+      "aria-pressed",
+      "false",
+    );
   });
 
   // Platform S4b: the whole channel chrome (banner, identity, tabs, toolbar) is fixed — it stays

frontend/e2e/feed.spec.ts

@@ -74,8 +74,6 @@ test.describe("feed", () => {
 
     // Switch the show filter → a different result set → back to the top.
     await page.getByTestId("feed-show-all").click();
-    await expect
-      .poll(() => page.getByRole("main").evaluate((el) => el.scrollTop))
-      .toBeLessThan(50);
+    await expect.poll(() => page.getByRole("main").evaluate((el) => el.scrollTop)).toBeLessThan(50);
   });
 });

frontend/e2e/global.setup.ts

@@ -37,7 +37,17 @@ setup("seed + authenticate", async ({ page }) => {
     try {
       const out = execFileSync(
         "docker",
-        ["exec", "-i", "-e", `E2E_EMAIL=${EMAIL}`, "-e", `E2E_PASSWORD=${PASSWORD}`, CONTAINER, "python", "-"],
+        [
+          "exec",
+          "-i",
+          "-e",
+          `E2E_EMAIL=${EMAIL}`,
+          "-e",
+          `E2E_PASSWORD=${PASSWORD}`,
+          CONTAINER,
+          "python",
+          "-",
+        ],
         { input: readFileSync(SEED_SCRIPT) },
       );
       console.log(`[e2e seed] ${out.toString().trim()}`);

frontend/e2e/nav.spec.ts

@@ -7,7 +7,17 @@ import { openApp } from "./helpers";
 test.describe("page switching", () => {
   // Core + admin modules (the E2E account is an admin, matching the real primary user), so this
   // also exercises the render ternary's admin branches (scheduler / config / users / audit).
-  const RAIL = ["channels", "playlists", "stats", "scheduler", "config", "users", "audit", "settings", "feed"];
+  const RAIL = [
+    "channels",
+    "playlists",
+    "stats",
+    "scheduler",
+    "config",
+    "users",
+    "audit",
+    "settings",
+    "feed",
+  ];
 
   test("each rail item activates its page", async ({ page }) => {
     await openApp(page);