docs(site): show all six themes, and put the demo line in English

Adds a gallery of the same Today view in each of the six themes — Northern lights,
Charcoal, Dusk, Daylight, Paper, Contrast — so the range is shown rather than
described, on the landing page and (as the swatch panel) the docs home. The lone
Charcoal Today capture is folded into it.

And the quick-add demo that leads the docs — "betal moms i morgen kl 10 p1 #Firma
@regnskab" — is now English, "file the VAT return tomorrow at 10am p1 #Accounts
@tax", on every page it appears as the line to type: the home, the quick-add page,
the API and MCP examples, and the OpenAPI blurb. The Danish date words on the
quick-add page stay, because documenting the Danish parser is their job.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

site/index.html

@@ -1050,6 +1050,75 @@
 						<figcaption>Integrations: your mailbox, your calendar feed, your address.</figcaption>
 					</figure>
 				</div>
+
+				<h3 class="sub">Six themes, the same day</h3>
+				<p class="muted">
+					Three dark and three light — a property of the screen you are sitting at, a
+					laptop in the sun and a monitor in a dark room wanting different answers. The
+					typeface and how tight it sits are chosen apart from them.
+				</p>
+				<div class="shots">
+					<figure class="shot">
+						<img
+							src="screenshots/theme-northern-lights.webp"
+							alt="The Today view in the Northern lights theme: dark, with a green accent."
+							width="1400"
+							height="900"
+							loading="lazy"
+						/>
+						<figcaption>Northern lights — dark, a green accent. The default.</figcaption>
+					</figure>
+					<figure class="shot">
+						<img
+							src="screenshots/theme-charcoal.webp"
+							alt="The Today view in the Charcoal theme: a warm near-black modelled on Apple Notes, with amber for the accent."
+							width="1400"
+							height="900"
+							loading="lazy"
+						/>
+						<figcaption>Charcoal — a warm near-black after Apple Notes, amber accent.</figcaption>
+					</figure>
+					<figure class="shot">
+						<img
+							src="screenshots/theme-dusk.webp"
+							alt="The Today view in the Dusk theme: dark and warm, with an amber accent."
+							width="1400"
+							height="900"
+							loading="lazy"
+						/>
+						<figcaption>Dusk — dark and warm.</figcaption>
+					</figure>
+					<figure class="shot">
+						<img
+							src="screenshots/theme-daylight.webp"
+							alt="The Today view in the Daylight theme: light and coolly neutral."
+							width="1400"
+							height="900"
+							loading="lazy"
+						/>
+						<figcaption>Daylight — light and coolly neutral.</figcaption>
+					</figure>
+					<figure class="shot">
+						<img
+							src="screenshots/theme-paper.webp"
+							alt="The Today view in the Paper theme: light and warm, like paper."
+							width="1400"
+							height="900"
+							loading="lazy"
+						/>
+						<figcaption>Paper — light and warm, like paper.</figcaption>
+					</figure>
+					<figure class="shot">
+						<img
+							src="screenshots/theme-contrast.webp"
+							alt="The Today view in the Contrast theme: black on white, for bright light."
+							width="1400"
+							height="900"
+							loading="lazy"
+						/>
+						<figcaption>Contrast — black on white, for bright light.</figcaption>
+					</figure>
+				</div>
 			</section>
 
 			<section id="features">