feat(Manifest, Background): add action configuration for extension icon and click behavior

public/background.js

@@ -23,3 +23,7 @@ chrome.webRequest.onBeforeRequest.addListener(
 	},
 	{ urls: ['https://monster-siren.hypergryph.com/manifest.json'] },
 )
+
+chrome.action.onClicked.addListener(() => {
+	chrome.tabs.create({ url: chrome.runtime.getURL('index.html') })
+})

public/manifest.json

@@ -25,6 +25,14 @@
 		"48": "vite.svg",
 		"128": "vite.svg"
 	},
+	"action": {
+		"default_title": "打开 MSR Mod",
+		"default_icon": {
+			"16": "vite.svg",
+			"48": "vite.svg",
+			"128": "vite.svg"
+		}
+	},
 	"background": {
 		"service_worker": "background.js"
 	},