feat(settings): a quiet Buy me a coffee link

A donate link belongs in Settings and nowhere in the way — so it sits last,
understated, below the device list. A plain anchor with an inline SVG cup:
no third-party script, no webfont, no tracking, so it works offline and
cannot phone home. Wording says the app is MIT with nothing held back and
that nothing changes if you don't pay.

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

web/src/routes/indstillinger/+page.svelte

@@ -571,6 +571,42 @@
 	</ul>
 </section>
 
+<!-- Last, and quietly: a donate link belongs in Settings, never in the way of the
+     work. A plain anchor with an inline SVG — no third-party script, no webfont,
+     no tracking — so it works offline and cannot phone home. See the coffee-cup
+     snippet for why not their generated button. -->
+<section class="panel">
+	<header>
+		<h2>{t('account.support')}</h2>
+		<p class="hint">{t('account.supportHint')}</p>
+	</header>
+
+	<a
+		class="bmc"
+		href="https://buymeacoffee.com/kristianwind"
+		target="_blank"
+		rel="noopener noreferrer"
+	>
+		<svg
+			width="16"
+			height="16"
+			viewBox="0 0 24 24"
+			fill="none"
+			stroke="currentColor"
+			stroke-width="1.8"
+			stroke-linecap="round"
+			stroke-linejoin="round"
+			aria-hidden="true"
+			focusable="false"
+		>
+			<path d="M4 9h13v6a4 4 0 0 1-4 4H8a4 4 0 0 1-4-4V9Z" />
+			<path d="M17 10h1.5a2.5 2.5 0 0 1 0 5H17" />
+			<path d="M7.5 5.6c0-.9.8-1.1.8-2M11 5.6c0-.9.8-1.1.8-2M14.5 5.6c0-.9.8-1.1.8-2" />
+		</svg>
+		{t('account.buyCoffee')} ↗
+	</a>
+</section>
+
 <style>
 	.looks {
 		margin-top: var(--s4);
@@ -771,4 +807,36 @@
 	.uri {
 		overflow-wrap: anywhere;
 	}
+
+	/* The understated variant: present, not loud. Bordered and in the muted ink so
+	   it reads as a footnote, brightening on hover. The cup is outline-only. */
+	.bmc {
+		align-self: flex-start;
+		display: inline-flex;
+		align-items: center;
+		gap: var(--s2);
+		padding: var(--s2) var(--s3);
+		border: 1px solid var(--line-strong);
+		border-radius: var(--radius);
+		color: var(--ink-muted);
+		text-decoration: none;
+		font-size: var(--text-sm);
+		transition:
+			color var(--fast) var(--ease),
+			border-color var(--fast) var(--ease);
+	}
+
+	.bmc:hover {
+		color: var(--ink);
+		border-color: var(--ink-muted);
+	}
+
+	.bmc:focus-visible {
+		outline: 2px solid var(--accent);
+		outline-offset: 2px;
+	}
+
+	.bmc svg {
+		flex: none;
+	}
 </style>