feat(ui): give the app one visual identity as Movie Loop

Gold is the primary in both themes, Bricolage Grotesque carries the
wordmark, titles and the score, and Movie A / Movie B wear the blue and
magenta of three-strip Technicolor on their posters instead of colouring
whole rows. The loop closes on screen - connectors light, a gold line
draws back to Movie A, the row glows, then the result arrives - in place
of confetti, on every play mode, scaled to the chain's length. Every
page shares one header and hairline lists; copy is sentence case with
one verb per flow, and the Home hero shows a real finished loop.

Also clamps link counts at zero: an opponent who had not moved yet
showed "-1 links".

src/pages/AsyncVersusGame.test.tsx

@@ -2,6 +2,13 @@ import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import { Link, MemoryRouter, Route, Routes } from 'react-router';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+// The completion modal waits for the loop-closing animation; there is none
+// to wait for in jsdom, and these tests are about the content, not the delay.
+vi.mock('@/lib/motion', async (importOriginal) => ({
+  ...(await importOriginal<typeof import('@/lib/motion')>()),
+  prefersReducedMotion: () => true,
+}));
 import type {
   ActorChainLink,
   MovieChainLink,
@@ -231,7 +238,7 @@ function renderPage(initialEntry = '/versus/async-game/match-1') {
  * target card + target badge), so wait on the chain-length badge instead -
  * it renders exactly once, as soon as the game is ready to play. */
 async function waitForReady() {
-  await screen.findByText('Chain: 0 links');
+  await screen.findByText('0 links');
 }
 
 beforeEach(() => {
@@ -364,7 +371,7 @@ describe('abort on unmount (WP cleanup)', () => {
     // Switch to a different match before match-1's slow session finishes.
     await userEvent.click(screen.getByText('go to match 2'));
     await flush();
-    expect(await screen.findByText('Chain: 0 links')).toBeInTheDocument();
+    expect(await screen.findByText('0 links')).toBeInTheDocument();
     expect(useGameStore.getState().movieA?.title).toBe('Third');
 
     // match-1's delayed movie details now arrive - after being superseded.
@@ -391,8 +398,8 @@ describe('creator mode', () => {
 
     expect(submitCreatorScore).toHaveBeenCalledWith('match-1', { sessionId: 'session-1' });
     expect(submitCreatorScore).toHaveBeenCalledTimes(1);
-    expect(await screen.findByText('Score Submitted!')).toBeInTheDocument();
-    expect(screen.getByText('2400')).toBeInTheDocument();
+    expect(await screen.findByText('Score submitted')).toBeInTheDocument();
+    expect(screen.getByText('2,400')).toBeInTheDocument();
   });
 
   it('navigates from the completion modal to the leaderboard', async () => {
@@ -400,9 +407,9 @@ describe('creator mode', () => {
     renderPage();
     await waitForReady();
     closeTheLoop();
-    await screen.findByText('Score Submitted!');
+    await screen.findByText('Score submitted');
 
-    await userEvent.click(screen.getByRole('button', { name: 'View Leaderboard' }));
+    await userEvent.click(screen.getByRole('button', { name: 'View leaderboard' }));
     expect(await screen.findByText('leaderboard route')).toBeInTheDocument();
   });
 
@@ -440,8 +447,8 @@ describe('challenger mode', () => {
 
     expect(submitAsyncAttempt).toHaveBeenCalledWith('match-1', { sessionId: 'session-1' });
     expect(submitAsyncAttempt).toHaveBeenCalledTimes(1);
-    expect(await screen.findByText('Challenge Complete!')).toBeInTheDocument();
-    expect(screen.getByText('You beat the creator!')).toBeInTheDocument();
+    expect(await screen.findByText('Challenge complete')).toBeInTheDocument();
+    expect(screen.getByText('You beat the creator')).toBeInTheDocument();
     expect(screen.getByText('Your rank:')).toBeInTheDocument();
     expect(screen.getByText('#1')).toBeInTheDocument();
   });
@@ -464,7 +471,7 @@ describe('challenger mode', () => {
     closeTheLoop();
     await flush();
 
-    expect(await screen.findByText('Challenge Complete!')).toBeInTheDocument();
+    expect(await screen.findByText('Challenge complete')).toBeInTheDocument();
     expect(screen.queryByText('Your rank:')).toBeNull();
   });