refactor: remove FFmpeg dependencies and related video processing logic

- Deleted FFmpeg related packages from package.json and package-lock.json.
- Removed video transcoding and editing functionalities from FileContent.vue.
- Simplified video handling logic and error management in FileContent.vue.
- Added a clear button in MilkdownEditor.vue for clearing the editor content.
- Enhanced UniverPreview.vue to clear detached popups and mount nodes on destroy.
- Updated docBlockPlugin.ts to improve context handling for document blocks.
- Cleaned up vite.config.js by removing cross-origin isolation headers.

package-lock.json

@@ -9,10 +9,6 @@
       "version": "0.0.0",
       "dependencies": {
         "@blocknote/xl-docx-exporter": "^0.47.3",
-        "@ffmpeg/core": "^0.12.10",
-        "@ffmpeg/core-mt": "^0.12.10",
-        "@ffmpeg/ffmpeg": "^0.12.15",
-        "@ffmpeg/util": "^0.12.2",
         "@milkdown/core": "^7.18.0",
         "@milkdown/crepe": "^7.18.0",
         "@milkdown/kit": "^7.18.0",
@@ -34,6 +30,7 @@
         "mermaid": "^11.12.3",
         "pinia": "^2.3.1",
         "prismjs": "^1.29.0",
+        "tui-color-picker": "^2.2.8",
         "tui-image-editor": "^3.15.3",
         "vue": "^3.5.24",
         "vue-router": "^4.6.4"
@@ -1212,54 +1209,6 @@
         "node": ">=18"
       }
     },
-    "node_modules/@ffmpeg/core": {
-      "version": "0.12.10",
-      "resolved": "https://registry.npmjs.org/@ffmpeg/core/-/core-0.12.10.tgz",
-      "integrity": "sha512-dzNplnn2Nxle2c2i2rrDhqcB19q9cglCkWnoMTDN9Q9l3PvdjZWd1HfSPjCNWc/p8Q3CT+Es9fWOR0UhAeYQZA==",
-      "license": "GPL-2.0-or-later",
-      "engines": {
-        "node": ">=16.x"
-      }
-    },
-    "node_modules/@ffmpeg/core-mt": {
-      "version": "0.12.10",
-      "resolved": "https://registry.npmjs.org/@ffmpeg/core-mt/-/core-mt-0.12.10.tgz",
-      "integrity": "sha512-atyRTOpa58bLCIgd6GXBZAXWyWD3AUoQyzxqjvGhp9MuSzdILtOTI62ffLswBsCnLq15lQ8IETHUpm1oe4V9FQ==",
-      "license": "GPL-2.0-or-later",
-      "engines": {
-        "node": ">=16.x"
-      }
-    },
-    "node_modules/@ffmpeg/ffmpeg": {
-      "version": "0.12.15",
-      "resolved": "https://registry.npmjs.org/@ffmpeg/ffmpeg/-/ffmpeg-0.12.15.tgz",
-      "integrity": "sha512-1C8Obr4GsN3xw+/1Ww6PFM84wSQAGsdoTuTWPOj2OizsRDLT4CXTaVjPhkw6ARyDus1B9X/L2LiXHqYYsGnRFw==",
-      "license": "MIT",
-      "dependencies": {
-        "@ffmpeg/types": "^0.12.4"
-      },
-      "engines": {
-        "node": ">=18.x"
-      }
-    },
-    "node_modules/@ffmpeg/types": {
-      "version": "0.12.4",
-      "resolved": "https://registry.npmjs.org/@ffmpeg/types/-/types-0.12.4.tgz",
-      "integrity": "sha512-k9vJQNBGTxE5AhYDtOYR5rO5fKsspbg51gbcwtbkw2lCdoIILzklulcjJfIDwrtn7XhDeF2M+THwJ2FGrLeV6A==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=16.x"
-      }
-    },
-    "node_modules/@ffmpeg/util": {
-      "version": "0.12.2",
-      "resolved": "https://registry.npmjs.org/@ffmpeg/util/-/util-0.12.2.tgz",
-      "integrity": "sha512-ouyoW+4JB7WxjeZ2y6KpRvB+dLp7Cp4ro8z0HIVpZVCM7AwFlHa0c4R8Y/a4M3wMqATpYKhC7lSFHQ0T11MEDw==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=18.x"
-      }
-    },
     "node_modules/@flatten-js/interval-tree": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/@flatten-js/interval-tree/-/interval-tree-1.1.3.tgz",