refactor: event modernization and optimization (#2404)

- Refactor methods names and functionality
- Replace scroll listeners with observers
- Replace Tweezer-based scrolling with native scroll methods
- Remove tweezer.js dependency
- Remove redundant method calls
- Rename $resetEvents to onNavigate
- Rename __scrollActiveSidebar to onRender
- Remove __getAndActive
- Remove __sticky
- Add IntersectionObserver mock to Jest environment

Also included:

- Add e2e test “ui” and “chromium” scripts
- Rename "jest" script to "test:jest"
- Remove unused SSR code

---------

Co-authored-by: Koy Zhuang <koy@ko8e24.top>

package.json

@@ -28,19 +28,18 @@
     "build:css": "mkdirp lib/themes && node build/css -o lib/themes",
     "build:emoji": "node ./build/emoji.js",
     "build:js": "cross-env NODE_ENV=production node build/build.js",
-    "build:test": "npm run build && npm test",
-    "build": "rimraf lib themes && run-s build:js build:css build:css:min build:cover build:emoji",
+    "build": "run-s clean build:js build:css build:css:min build:cover build:emoji",
+    "clean": "rimraf lib themes _playwright*",
     "dev": "run-p serve:dev watch:*",
     "docker:build:test": "npm run docker:cli -- build:test",
     "docker:build": "docker build -f Dockerfile -t docsify-test:local .",
     "docker:clean": "docker rmi docsify-test:local",
     "docker:cli": "docker run --rm -it --ipc=host --mount type=bind,source=$(pwd)/test,target=/app/test docsify-test:local",
-    "docker:rebuild": "npm run docker:clean && npm run docker:build",
+    "docker:rebuild": "run-s docker:clean docker:build",
     "docker:test:e2e": "npm run docker:cli -- test:e2e",
     "docker:test:integration": "npm run docker:cli -- test:integration",
     "docker:test:unit": "npm run docker:cli -- test:unit",
     "docker:test": "npm run docker:cli -- test",
-    "jest": "cross-env NODE_OPTIONS=--experimental-vm-modules jest",
     "lint:fix": "eslint . --fix",
     "lint": "prettier . --check && eslint .",
     "postinstall": "opencollective-postinstall && npx husky install",
@@ -51,9 +50,12 @@
     "serve:dev": "npm run serve -- --dev",
     "serve": "node server",
     "test:e2e": "playwright test",
-    "test:integration": "npm run jest -- --selectProjects integration",
-    "test:unit": "npm run jest -- --selectProjects unit",
-    "test": "npm run jest && run-s test:e2e",
+    "test:e2e:chromium": "playwright test --project='chromium'",
+    "test:e2e:ui": "playwright test --ui",
+    "test:integration": "npm run test:jest -- --selectProjects integration",
+    "test:jest": "cross-env NODE_OPTIONS=--experimental-vm-modules jest",
+    "test:unit": "npm run test:jest -- --selectProjects unit",
+    "test": "run-s test:jest test:e2e",
     "watch:css": "npm run build:css -- -w",
     "watch:js": "node build/build.js"
   },
@@ -66,8 +68,7 @@
     "opencollective-postinstall": "^2.0.2",
     "prismjs": "^1.29.0",
     "strip-indent": "^3.0.0",
-    "tinydate": "^1.3.0",
-    "tweezer.js": "^1.4.0"
+    "tinydate": "^1.3.0"
   },
   "devDependencies": {
     "@babel/core": "^7.11.6",