feat(share): refactor page and enhance thumbnail extraction

- Extract 8 reusable components from monolithic share page
- Add LLM health indicator with 30s polling
- Implement stealth thumbnail extraction with 4-method cascade
- Integrate real-time thumbnail preview component
- Reduce share page from 306 to ~140 lines
- Add comprehensive outcome documentation

Components:
- UrlInputSection: URL input and extraction trigger
- ProgressIndicator: Loading state display
- ExtractedTextViewer: Collapsible text preview
- RecipeCard: Recipe display with Tandoor integration
- ErrorState: Error handling UI
- LogViewer: System logs with color coding
- LlmHealthIndicator: LLM status with polling
- ThumbnailPreview: Real-time thumbnail display

Thumbnail Methods:
1. Meta tag extraction (og:image, twitter:image)
2. Video poster attribute
3. Instagram embedded JSON data
4. Screenshot fallback

Stories Completed:
- Story 1: Component extraction and refactoring
- Story 2: LLM health status indicator
- Story 3: Enhanced stealth thumbnail extraction
- Story 4: Thumbnail preview integration

Closes: RefactorSharePageAndEnhanceThumbnails

src/routes/share/components/ExtractedTextViewer.svelte

@@ -0,0 +1,14 @@
+<script lang="ts">
+	let { bodyText = '' } = $props<{
+		bodyText: string;
+	}>();
+</script>
+
+{#if bodyText}
+	<details class="border rounded p-2 bg-white text-sm">
+		<summary class="cursor-pointer font-semibold">📝 View Extracted Text</summary>
+		<div class="mt-2 pt-2 border-t whitespace-pre-wrap break-word max-h-48 overflow-y-auto text-xs">
+			{bodyText}
+		</div>
+	</details>
+{/if}