feat(floating-button): add Mevx-style floating quick action button

- Create floating-button.tsx content script with inline UI
- Button appears on crypto pages (DexScreener, Twitter, CoinGecko, etc.)
- Shows quick token analysis popup on click
- Displays token price, 24h change, and quick stats
- 'Full Analysis' button opens sidepanel for detailed view
- Update background/index.ts to handle OPEN_SIDEPANEL message
- Gradient purple button with smooth animations
- Fixed positioning (bottom-right corner)
- Clean, modern popup design with inline styles

Implements Task 3: Create Floating Quick Action Button
Similar to Mevx's approach for quick token insights

surfsense_browser_extension/background/index.ts

@@ -7,6 +7,17 @@ chrome.sidePanel
 	.setPanelBehavior({ openPanelOnActionClick: true })
 	.catch((error) => console.error("Failed to set side panel behavior:", error));
 
+// Listen for messages from content scripts
+chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
+	if (message.type === "OPEN_SIDEPANEL") {
+		// Open sidepanel for the current tab
+		if (sender.tab?.id) {
+			chrome.sidePanel.open({ tabId: sender.tab.id })
+				.catch((error) => console.error("Failed to open side panel:", error));
+		}
+	}
+});
+
 chrome.tabs.onCreated.addListener(async (tab: any) => {
 	try {
 		await initWebHistory(tab.id);