test(stories): cover scrolly step text and back-to-top; fix build-output note

S8 asserts scrolly-section splits its slot content into visible step panels
(the blank-text-column regression had no coverage: S3 only checked the image
column existed, and the silent early return threw nothing for S4 to catch).
S9 covers back-to-top now that main.js solely owns it, including the history
entry the removed inline copy lacked.

CLAUDE.md attributed css-compiled/ and fonts/ to css/style.css and
css/tokens.css. They are built from the js/src/ entrypoints' CSS and font
imports; css/ is hand-authored and served directly, needing no rebuild.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/ui/stories/stories.spec.js

@@ -1,5 +1,5 @@
 // @ts-check
-// Tests: S1–S7 — story mode rendering and navigation
+// Tests: S1–S9 — story mode rendering and navigation
 // Requires demo data: run `make demo-load` before this suite.
 const { test, expect } = require('@playwright/test');
 
@@ -85,3 +85,74 @@ test('S7: story body back link has back-pill class', async ({ page }) => {
     await expect(bodyBack).toBeAttached();
     await expect(bodyBack).toHaveText(/← Back/);
 });
+
+// ── S8: Scrolly-section text panels actually render beside the pinned image ───
+// The server ships the panel text inside .scrolly__steps-content, which CSS hides
+// (style.css: `display: none`). Only the inline Scrollama block in story.html.twig
+// splits it into visible .scrolly-step divs — and it early-returns silently if the
+// main.js bundle (which sets window.scrollama) hasn't executed yet. S3 asserted the
+// image column exists; nothing asserted the text column was non-empty.
+test('S8: scrolly-section builds visible step panels from its slot content', async ({ page }) => {
+    await page.goto(STORY_SCROLLY);
+    await expect(page.locator('.story-hero__img')).toBeVisible({ timeout: 8000 });
+
+    // The bundle must have published scrollama before the inline block ran
+    expect(
+        await page.evaluate(() => typeof window.scrollama !== 'undefined'),
+        'window.scrollama published by main.js bundle'
+    ).toBe(true);
+
+    // Every scrolly-section must have produced at least one step
+    const sections = page.locator('.scrolly');
+    const sectionCount = await sections.count();
+    expect(sectionCount, 'Two scrolly-sections').toBe(2);
+
+    for (let i = 0; i < sectionCount; i++) {
+        const section = sections.nth(i);
+        const steps = section.locator('.scrolly-step');
+        expect(
+            await steps.count(),
+            `scrolly-section ${i} split its slot content into steps`
+        ).toBeGreaterThan(0);
+    }
+
+    // …and the text must be readable, not left hidden in the raw slot.
+    // Scroll each step into view so its reveal transition completes.
+    const firstStep = page.locator('.scrolly').first().locator('.scrolly-step').first();
+    await firstStep.scrollIntoViewIfNeeded();
+    await page.waitForTimeout(800);
+    await expect(firstStep.locator('.scrolly-step__inner')).toBeVisible();
+    const text = (await firstStep.innerText()).trim();
+    expect(text.length, 'First step panel renders non-empty text').toBeGreaterThan(20);
+});
+
+// ── S9: Back-to-top is wired once, by main.js, and pushes a history entry ─────
+// The inline duplicate in story.html.twig was removed; initBackToTop() in
+// js/src/main.js now solely owns #story-totop. That makes the button depend on
+// the bundle having loaded, so assert the observable behaviour end to end.
+test('S9: story back-to-top reveals on scroll, returns to top, and pushes history', async ({ page }) => {
+    await page.goto(STORY_SCROLLY);
+    await expect(page.locator('.story-hero__img')).toBeVisible({ timeout: 8000 });
+
+    const btn = page.locator('#story-totop');
+    await expect(btn).toBeAttached();
+
+    // Hidden until scrolled past the 0.8 * viewport threshold
+    await expect(btn).not.toHaveClass(/is-visible/);
+
+    const historyBefore = await page.evaluate(() => history.length);
+
+    await page.evaluate(() => window.scrollTo(0, window.innerHeight * 2));
+    await expect(btn).toHaveClass(/is-visible/, { timeout: 3000 });
+
+    await btn.click();
+    await expect
+        .poll(() => page.evaluate(() => window.scrollY), { timeout: 3000 })
+        .toBeLessThan(10);
+
+    // main.js's variant pushes a history entry; the removed inline copy did not
+    expect(
+        await page.evaluate(() => history.length),
+        'Back-to-top pushed a history entry'
+    ).toBeGreaterThan(historyBefore);
+});