feat: Add image uploader and metadata viewer components

- Implemented ImageUploader.svelte for drag-and-drop image uploads with metadata extraction.
- Created MetadataViewer.svelte to display extracted metadata in a user-friendly format.
- Added PrivacyInfo.svelte to inform users about client-side processing and privacy risks.
- Introduced ThemeToggle.svelte for dark mode functionality.
- Set up main.js for application entry point and configured Svelte with vite.
- Added Tailwind CSS for styling and configured Vite for asset management.
- Established svelte.config.js and tailwind.config.js for project settings.

src/lib/ThemeToggle.svelte

@@ -0,0 +1,34 @@
+<script>
+  import { createEventDispatcher } from "svelte";
+
+  const dispatch = createEventDispatcher();
+
+  export let darkMode = false;
+
+  function toggle() {
+    dispatch("toggle");
+  }
+</script>
+
+<button
+  class="theme-toggle"
+  on:click={toggle}
+  aria-label="Toggle dark mode"
+  title="Toggle dark mode"
+>
+  {#if darkMode}
+    <svg width="24" height="24" fill="currentColor" viewBox="0 0 20 20">
+      <path
+        fill-rule="evenodd"
+        d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z"
+        clip-rule="evenodd"
+      />
+    </svg>
+  {:else}
+    <svg width="24" height="24" fill="currentColor" viewBox="0 0 20 20">
+      <path
+        d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z"
+      />
+    </svg>
+  {/if}
+</button>