fix(geschichte): raise journey reading text to the accessibility floor

Intro, letter titles, curator annotations, and interludes rendered at
12-14px — copied from the scaled mockup sizes in LR-2. Narrative text
is now 16-18px, meta lines and links 14px; the LR-2 impl-ref table is
updated to match.

Closes #800
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/lib/geschichte/JourneyInterlude.svelte.spec.ts

@@ -35,6 +35,14 @@ describe('JourneyInterlude', () => {
 		expect(el?.getAttribute('aria-label')).toBe(m.journey_interlude_aria_label());
 	});
 
+	it('note text uses readable body size (text-base, #800)', async () => {
+		render(JourneyInterlude, { props: { note: 'Notiz' } });
+
+		const text = document.querySelector('[role="note"] p');
+		expect(text!.className).toContain('text-base');
+		expect(text!.className).not.toContain('text-xs');
+	});
+
 	it('XSS: note is rendered as plaintext — injected payload does not execute', async () => {
 		// Interlude uses Svelte text interpolation ({note}), NOT {@html}.
 		render(JourneyInterlude, {