server : (UI) add tok/s, get rid of completion.js (#10786)

* get rid of completion.js

* extract chat bubble to a component

* add tok/s info

* sync

* fix BASE_URL

* only extract timings when it's enabled

* fix auto scroll

examples/server/webui/package-lock.json

@@ -13,6 +13,7 @@
         "markdown-it": "^14.1.0",
         "postcss": "^8.4.49",
         "tailwindcss": "^3.4.15",
+        "textlinestream": "^1.1.1",
         "vite-plugin-singlefile": "^2.0.3",
         "vue": "^3.5.13"
       },
@@ -2677,6 +2678,12 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/textlinestream": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/textlinestream/-/textlinestream-1.1.1.tgz",
+      "integrity": "sha512-iBHbi7BQxrFmwZUQJsT0SjNzlLLsXhvW/kg7EyOMVMBIrlnj/qYofwo1LVLZi+3GbUEo96Iu2eqToI2+lZoAEQ==",
+      "license": "MIT"
+    },
     "node_modules/uc.micro": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-2.1.0.tgz",