refactor(base64): split base64 text and file conversion in two tools + base64 to file

package.json

@@ -47,6 +47,7 @@
     "highlight.js": "^11.5.1",
     "lodash": "^4.17.21",
     "mathjs": "^10.6.0",
+    "mime-types": "^2.1.35",
     "naive-ui": "^2.31.0",
     "pinia": "^2.0.11",
     "plausible-tracker": "^0.3.5",
@@ -62,6 +63,7 @@
     "@types/bcryptjs": "^2.4.2",
     "@types/crypto-js": "^4.1.1",
     "@types/jsdom": "^16.2.14",
+    "@types/mime-types": "^2.1.1",
     "@types/node": "^16.11.25",
     "@types/qrcode": "^1.4.2",
     "@types/randombytes": "^2.0.0",