feat: implement camera capture integration

Add CameraCapture component with full photo/video support via getUserMedia,
integrated into the upload page alongside the existing library picker.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/components/CameraCapture.svelte

@@ -8,8 +8,8 @@
 
 	let { oncapture, onclose }: Props = $props();
 
-	let videoEl: HTMLVideoElement;
+	let videoEl: HTMLVideoElement = $state()!;
-	let canvasEl: HTMLCanvasElement;
+	let canvasEl: HTMLCanvasElement = $state()!;
 	let stream: MediaStream | null = $state(null);
 	let facingMode = $state<'environment' | 'user'>('environment');
 	let recording = $state(false);

frontend/src/routes/upload/+page.svelte

@@ -3,11 +3,13 @@
 	import { getToken } from '$lib/auth';
 	import { addToQueue, loadQueue } from '$lib/upload-queue';
 	import UploadQueue from '$lib/components/UploadQueue.svelte';
+	import CameraCapture from '$lib/components/CameraCapture.svelte';
 	import { onMount } from 'svelte';
 
 	let caption = $state('');
 	let hashtags = $state('');
 	let fileInput: HTMLInputElement;
+	let showCamera = $state(false);
 
 	onMount(() => {
 		if (!getToken()) {
@@ -30,8 +32,23 @@
 		hashtags = '';
 		if (fileInput) fileInput.value = '';
 	}
+
+	async function handleCapture(blob: Blob, type: 'photo' | 'video') {
+		const ext = type === 'photo' ? 'jpg' : blob.type.includes('mp4') ? 'mp4' : 'webm';
+		const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
+		const fileName = `${type}_${timestamp}.${ext}`;
+		const file = new File([blob], fileName, { type: blob.type });
+		await addToQueue(file, caption, hashtags);
+	}
 </script>
 
+{#if showCamera}
+	<CameraCapture
+		oncapture={handleCapture}
+		onclose={() => (showCamera = false)}
+	/>
+{/if}
+
 <div class="min-h-screen bg-gray-50 p-4">
 	<div class="mx-auto max-w-lg">
 		<div class="mb-6 flex items-center justify-between">
@@ -40,23 +57,39 @@
 		</div>
 
 		<div class="rounded-lg border border-gray-200 bg-white p-4">
-			<label
+			<div class="grid grid-cols-2 gap-3">
-				class="flex cursor-pointer flex-col items-center justify-center rounded-lg border-2 border-dashed border-gray-300 bg-gray-50 p-8 transition hover:border-blue-400 hover:bg-blue-50"
+				<!-- File picker -->
-			>
+				<label
-				<svg class="mb-2 h-10 w-10 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+					class="flex cursor-pointer flex-col items-center justify-center rounded-lg border-2 border-dashed border-gray-300 bg-gray-50 p-6 transition hover:border-blue-400 hover:bg-blue-50"
-					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M12 16V4m0 0l-4 4m4-4l4 4M4 20h16" />
+				>
-				</svg>
+					<svg class="mb-2 h-8 w-8 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
-				<span class="text-sm font-medium text-gray-600">Fotos oder Videos auswählen</span>
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M12 16V4m0 0l-4 4m4-4l4 4M4 20h16" />
-				<span class="mt-1 text-xs text-gray-400">Mehrere Dateien möglich</span>
+					</svg>
-				<input
+					<span class="text-center text-sm font-medium text-gray-600">Galerie</span>
-					bind:this={fileInput}
+					<span class="mt-1 text-center text-xs text-gray-400">Mehrere Dateien</span>
-					type="file"
+					<input
-					accept="image/*,video/*"
+						bind:this={fileInput}
-					multiple
+						type="file"
-					class="hidden"
+						accept="image/*,video/*"
-					onchange={handleFiles}
+						multiple
-				/>
+						class="hidden"
-			</label>
+						onchange={handleFiles}
+					/>
+				</label>
+
+				<!-- Camera button -->
+				<button
+					onclick={() => (showCamera = true)}
+					class="flex flex-col items-center justify-center rounded-lg border-2 border-dashed border-gray-300 bg-gray-50 p-6 transition hover:border-blue-400 hover:bg-blue-50"
+				>
+					<svg class="mb-2 h-8 w-8 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M3 9a2 2 0 012-2h.93a2 2 0 001.664-.89l.812-1.22A2 2 0 0110.07 4h3.86a2 2 0 011.664.89l.812 1.22A2 2 0 0018.07 7H19a2 2 0 012 2v9a2 2 0 01-2 2H5a2 2 0 01-2-2V9z" />
+						<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M15 13a3 3 0 11-6 0 3 3 0 016 0z" />
+					</svg>
+					<span class="text-sm font-medium text-gray-600">Kamera</span>
+					<span class="mt-1 text-xs text-gray-400">Foto & Video</span>
+				</button>
+			</div>
 
 			<div class="mt-4 space-y-3">
 				<input