Show the build's version and commit in Settings

vite.config.ts stamps the package version, git commit and build time
into the bundle as __BUILD__, and the Settings sidebar shows
"v0.1.0 · <short sha>" (full sha and build time on hover). The Docker
build has no git binary, so the commit is read from .git/HEAD and the
refs directly; .dockerignore now lets just those files through.
GIT_COMMIT in the environment overrides detection.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GaoZtJQZwLXkEgWs8twCia

src/app.d.ts

@@ -1,6 +1,9 @@
 // See https://svelte.dev/docs/kit/types#app.d.ts
 declare global {
 	namespace App {}
+
+	/** Stamped in by vite.config.ts at build time. */
+	const __BUILD__: { version: string; commit: string; dirty: boolean; time: string };
 }
 
 export {};

src/lib/components/SettingsModal.svelte

@@ -8,6 +8,7 @@
 	type Tab = 'appearance' | 'input' | 'sync';
 	let tab = $state<Tab>('appearance');
 	const s = settings.data;
+	const build = __BUILD__;
 
 	let testing = $state(false);
 	let testResult = $state<{ ok: boolean; text: string } | null>(null);
@@ -55,6 +56,9 @@
 			<button class:active={tab === 'appearance'} onclick={() => (tab = 'appearance')}>Appearance</button>
 			<button class:active={tab === 'input'} onclick={() => (tab = 'input')}>Pen &amp; touch</button>
 			<button class:active={tab === 'sync'} onclick={() => (tab = 'sync')}>Sync</button>
+			<div class="build" title={`Commit ${build.commit}\nBuilt ${new Date(build.time).toLocaleString()}`}>
+				v{build.version} · {build.commit.slice(0, 7)}{build.dirty ? '-dirty' : ''}
+			</div>
 		</nav>
 		<section>
 			<button class="icon-btn close" title="Close" onclick={close}><XIcon size={18} /></button>
@@ -187,6 +191,14 @@
 		color: var(--faint);
 		padding: 0 10px 8px;
 	}
+	.build {
+		margin-top: auto;
+		padding: 0 10px;
+		font-family: var(--mono-font);
+		font-size: 11px;
+		color: var(--faint);
+		user-select: text;
+	}
 	nav button {
 		text-align: left;
 		border: 0;