feat: update embed player design with transparent background and overlay stats

- Removed background colors from `embed.html` for transparency.
- Added a hover-triggered overlay with "Watch on BitVid" button and stats (views, likes, dislikes).
- Updated `js/ui/components/EmbedPlayerModal.js` to implement stats update methods and handle the overlay elements.
- Updated `js/embed.js` to set the share URL on the overlay after video resolution.
- Verified visual changes with Playwright.

verification/verify_embed.py

@@ -0,0 +1,43 @@
+from playwright.sync_api import sync_playwright
+import time
+
+def verify_embed_overlay():
+    with sync_playwright() as p:
+        browser = p.chromium.launch(headless=True)
+        context = browser.new_context()
+
+        # Inject disclaimer bypass
+        context.add_init_script("localStorage.setItem('hasSeenDisclaimer', 'true');")
+
+        page = context.new_page()
+
+        # Go to embed page
+        # Note: We don't have a valid pointer, so video won't load, but UI should be there.
+        page.goto("http://localhost:3000/embed.html")
+
+        # Wait for page load
+        time.sleep(2)
+
+        # Force hover on the container to show overlay
+        container = page.locator("#embedRoot section")
+        container.hover()
+
+        # Wait for transition
+        time.sleep(1)
+
+        # Check elements visibility
+        overlay = page.locator("#embedOverlay")
+        watch_btn = page.locator("#embedWatchButton")
+        stats = page.locator("#embedViewCount")
+
+        print(f"Overlay visible: {overlay.is_visible()}")
+        print(f"Watch button visible: {watch_btn.is_visible()}")
+        print(f"Stats visible: {stats.is_visible()}")
+
+        # Screenshot
+        page.screenshot(path="verification/embed_verification.png")
+
+        browser.close()
+
+if __name__ == "__main__":
+    verify_embed_overlay()