feat: add image paste support

Add image paste functionality allowing users to paste images directly
from the clipboard as files. Uses the standard DataTransfer API
(clipboardData.items) for cross-browser compatibility.

On the download page, images are now displayed as previews in addition
to the download option.

Also fix Rust 2024 never-type-fallback compatibility by adding turbofish
type annotations to redis crate calls.

packages/frontend/src/lib/ui/ShowNote.svelte

@@ -80,6 +80,15 @@
 				</button>
 				<small> {file.type} － {prettyBytes(file.size)}</small>
 			</div>
+			{#if file.type.startsWith('image/')}
+				{#key file.name}
+					<img
+						src={URL.createObjectURL(new File([file.contents], file.name, { type: file.type }))}
+						alt={file.name}
+						class="preview"
+					/>
+				{/key}
+			{/if}
 		{/each}
 		<Button onclick={download}>{$t('show.download_all')}</Button>
 	{/if}
@@ -130,4 +139,13 @@
 		margin-bottom: 0.5rem;
 		word-wrap: break-word;
 	}
+
+	.preview {
+		display: block;
+		max-width: 100%;
+		max-height: 60vh;
+		margin-bottom: 0.5rem;
+		border-radius: 0.25rem;
+		border: 2px solid var(--ui-bg-1);
+	}
 </style>