Add ViewModeSelector component with width controls

- Create ViewModeSelector component with masonry view mode button
- Add width toggle controls (normal 700px / wide 900px)
- Create width-normal and width-wide SVG icons
- Integrate component into photos route with smooth transitions
- Use SCSS variables throughout for consistent styling

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/assets/icons/width-normal.svg

@@ -0,0 +1,8 @@
+<svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- Normal width container -->
+  <rect x="5" y="4" width="10" height="12" rx="1" stroke="currentColor" stroke-width="1.5" fill="none"/>
+  <!-- Content lines -->
+  <line x1="7" y1="7" x2="13" y2="7" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <line x1="7" y1="10" x2="11" y2="10" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <line x1="7" y1="13" x2="13" y2="13" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+</svg>

src/assets/icons/width-wide.svg

@@ -0,0 +1,8 @@
+<svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <!-- Wide width container -->
+  <rect x="2" y="4" width="16" height="12" rx="1" stroke="currentColor" stroke-width="1.5" fill="none"/>
+  <!-- Content lines -->
+  <line x1="4" y1="7" x2="16" y2="7" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <line x1="4" y1="10" x2="12" y2="10" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+  <line x1="4" y1="13" x2="16" y2="13" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+</svg>

src/lib/components/ViewModeSelector.svelte

@@ -0,0 +1,101 @@
+<script lang="ts">
+	import { getContext } from 'svelte'
+	import PhotosIcon from '$icons/photos.svg?component'
+	import WidthNormalIcon from '$icons/width-normal.svg?component'
+	import WidthWideIcon from '$icons/width-wide.svg?component'
+
+	interface Props {
+		mode?: 'masonry'
+		width?: 'normal' | 'wide'
+		onWidthChange?: (width: 'normal' | 'wide') => void
+	}
+
+	let { 
+		mode = 'masonry',
+		width = 'normal',
+		onWidthChange
+	}: Props = $props()
+</script>
+
+<div class="view-mode-selector">
+	<div class="mode-section">
+		<button class="mode-button selected" aria-label="Masonry view">
+			<PhotosIcon />
+		</button>
+	</div>
+	
+	<div class="separator"></div>
+	
+	<div class="width-section">
+		<button 
+			class="mode-button" 
+			class:selected={width === 'normal'}
+			aria-label="Normal width"
+			onclick={() => onWidthChange?.('normal')}
+		>
+			<WidthNormalIcon />
+		</button>
+		<button 
+			class="mode-button"
+			class:selected={width === 'wide'}
+			aria-label="Wide width"
+			onclick={() => onWidthChange?.('wide')}
+		>
+			<WidthWideIcon />
+		</button>
+	</div>
+</div>
+
+<style lang="scss">
+	.view-mode-selector {
+		width: 100%;
+		background: $grey-100;
+		border-radius: $corner-radius-lg;
+		box-sizing: border-box;
+		padding: $unit;
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		gap: $unit-2x;
+		box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
+	}
+	
+	.mode-section,
+	.width-section {
+		display: flex;
+		gap: $unit-half;
+	}
+	
+	.separator {
+		flex: 1;
+		min-width: $unit-2x;
+	}
+
+	.mode-button {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		width: 36px;
+		height: 36px;
+		border: none;
+		background: transparent;
+		border-radius: $corner-radius-sm;
+		cursor: pointer;
+		transition: all 0.2s ease;
+		color: $grey-60;
+
+		&:hover {
+			background: $grey-95;
+		}
+
+		&.selected {
+			color: $red-60;
+			background: $salmon-pink;
+		}
+
+		:global(svg) {
+			width: 20px;
+			height: 20px;
+		}
+	}
+</style>

src/routes/photos/+page.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
 	import MasonryPhotoGrid from '$components/MasonryPhotoGrid.svelte'
 	import LoadingSpinner from '$components/admin/LoadingSpinner.svelte'
+	import ViewModeSelector from '$components/ViewModeSelector.svelte'
 	import { InfiniteLoader, LoaderState } from 'svelte-infinite'
 	import { generateMetaTags } from '$lib/utils/metadata'
 	import { page } from '$app/stores'
@@ -15,6 +16,7 @@
 	// Initialize state with server-side data
 	let allPhotoItems = $state<PhotoItem[]>(data.photoItems || [])
 	let currentOffset = $state(data.pagination?.limit || 20)
+	let containerWidth = $state<'normal' | 'wide'>('normal')
 
 	// Track loaded photo IDs to prevent duplicates
 	let loadedPhotoIds = $state(new Set(data.photoItems?.map((item) => item.id) || []))
@@ -100,7 +102,7 @@
 	<link rel="canonical" href={metaTags.other.canonical} />
 </svelte:head>
 
-<div class="photos-container">
+<div class="photos-container" class:wide={containerWidth === 'wide'}>
 	{#if error}
 		<div class="error-container">
 			<div class="error-message">
@@ -116,6 +118,10 @@
 			</div>
 		</div>
 	{:else}
+		<ViewModeSelector 
+			width={containerWidth}
+			onWidthChange={(width) => containerWidth = width}
+		/>
 		<MasonryPhotoGrid photoItems={allPhotoItems} />
 
 		<InfiniteLoader
@@ -163,6 +169,18 @@
 		max-width: 700px;
 		margin: 0 auto;
 		padding: 0 $unit-3x;
+		transition: max-width 0.3s ease;
+
+		&.wide {
+			max-width: 900px;
+		}
+
+		:global(.view-mode-selector) {
+			margin-bottom: $unit-3x;
+			position: sticky;
+			top: $unit-2x;
+			z-index: 10;
+		}
 
 		@include breakpoint('phone') {
 			padding: 0 $unit-2x;