refactor(transcript): drop Tonemark rewrite

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

package-lock.json

@@ -12,7 +12,8 @@
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         "form-data": "^4.0.5",
         "node-fetch": "^3.3.2",
-        "web-push": "^3.6.7"
+        "web-push": "^3.6.7",
+        "youtube-transcript": "^1.3.1"
       },
       "devDependencies": {
         "@sveltejs/adapter-auto": "^7.0.1",
@@ -89,6 +90,27 @@
         "node": ">=18"
       }
     },
+    "node_modules/@emnapi/core": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.10.0.tgz",
+      "integrity": "sha512-yq6OkJ4p82CAfPl0u9mQebQHKPJkY7WrIuk205cTYnYe+k2Z8YBh11FrbRG/H6ihirqcacOgl2BIO8oyMQLeXw==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@emnapi/wasi-threads": "1.2.1",
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@emnapi/runtime": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.10.0.tgz",
+      "integrity": "sha512-ewvYlk86xUoGI0zQRNq/mC+16R1QeDlKQy21Ki3oSYXNgLb45GV1P6A0M+/s6nyCuNDqe5VpaY84BzXGwVbwFA==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.2.1.tgz",
@@ -896,7 +918,6 @@
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
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         "@sveltejs/acorn-typescript": "^1.0.5",
@@ -938,7 +959,6 @@
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       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "deepmerge": "^4.3.1",
         "magic-string": "^0.30.21",
@@ -1313,7 +1333,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
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         "@vitest/utils": "4.1.5",
@@ -1467,7 +1486,6 @@
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       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -3021,7 +3039,6 @@
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.60.3.tgz",
       "integrity": "sha512-pAQK9HalE84QSm4Po3EmWIZPd3FnjkShVkiMlz1iligWYkWQ7wHYd1PF/T7QZ5TVSD6uSTon5gBVMSM4JfBV+A==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@types/estree": "1.0.8"
       },
@@ -3255,7 +3272,6 @@
       "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.55.5.tgz",
       "integrity": "sha512-2uCs/LZ9us+AktdzYJM8OcxQ8qnPS1kpaO7syGT/MgO+6Qr1Ybl+TqPq+97u7PHqmmMlye5ZkoyXONy5mjjAbw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jridgewell/remapping": "^2.3.4",
         "@jridgewell/sourcemap-codec": "^1.5.0",
@@ -3428,7 +3444,6 @@
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       "devOptional": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -3455,7 +3470,6 @@
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       "integrity": "sha512-rZuUu9j6J5uotLDs+cAA4O5H4K1SfPliUlQwqa6YEwSrWDZzP4rhm00oJR5snMewjxF5V/K3D4kctsUTsIU9Mw==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "lightningcss": "^1.32.0",
         "picomatch": "^4.0.4",
@@ -3553,7 +3567,6 @@
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       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@vitest/expect": "4.1.5",
         "@vitest/mocker": "4.1.5",
@@ -3689,6 +3702,15 @@
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       "license": "ISC"
     },
+    "node_modules/youtube-transcript": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/youtube-transcript/-/youtube-transcript-1.3.1.tgz",
+      "integrity": "sha512-NDCjwad113TGybbYF51y9Z4tcwzBHUZWQdF9veULNca18L+FdDbHHtTHIr69WVa3bB90l67S8kN0HtL2JO9fhg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/zimmerframe": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/zimmerframe/-/zimmerframe-1.1.4.tgz",