fix: rewrite document converter to preserve formatting in PDF output

Replace jsPDF.text() (plain text dump) with jsPDF.html() + html2canvas-pro
which renders actual styled DOM elements into the PDF. DOCX headings, bold,
italic, tables, lists, links now render correctly. All HTML output also gets
a full styled document wrapper with embedded CSS. HTML-to-Markdown converter
rewritten with proper DOM-walking parser instead of fragile regex.

package-lock.json

@@ -1,17 +1,18 @@
 {
-  "name": "2026-03-03_dbi_swift_macos_liquidglass",
+  "name": "transmute",
   "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "2026-03-03_dbi_swift_macos_liquidglass",
+      "name": "transmute",
       "version": "0.1.0",
       "dependencies": {
         "@ffmpeg/ffmpeg": "^0.12.15",
         "@ffmpeg/util": "^0.12.2",
         "fast-xml-parser": "^5.4.2",
         "framer-motion": "^12.35.2",
+        "html2canvas-pro": "^2.0.2",
         "js-yaml": "^4.1.1",
         "jspdf": "^4.2.0",
         "jszip": "^3.10.1",
@@ -2564,7 +2565,6 @@
       "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-1.0.2.tgz",
       "integrity": "sha512-I3yl4r9QB5ZRY3XuJVEPfc2XhZO6YweFPI+UovAzn+8/hb3oJ6lnysaFcjVpkCPfVWFUDvoZ8kmVDP7WyRtYtQ==",
       "license": "MIT",
-      "optional": true,
       "engines": {
         "node": ">= 0.6.0"
       }
@@ -2860,7 +2860,6 @@
       "resolved": "https://registry.npmjs.org/css-line-break/-/css-line-break-2.1.0.tgz",
       "integrity": "sha512-FHcKFCZcAha3LwfVBhCQbW2nCNbkZXn7KVUJcsT5/P8YmfsVja0FMPJr0B903j/E69HUphKiV9iQArX8SDYA4w==",
       "license": "MIT",
-      "optional": true,
       "dependencies": {
         "utrie": "^1.0.2"
       }
@@ -4253,6 +4252,19 @@
         "node": ">=8.0.0"
       }
     },
+    "node_modules/html2canvas-pro": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/html2canvas-pro/-/html2canvas-pro-2.0.2.tgz",
+      "integrity": "sha512-9G/t0XgCZWonLwL0JwI7su6NdbOPUY7Ur4Ihpp8+XMaW9ibA2nDXF181Jr6tm94k8lX6sthpaXB3XqEnsMd5Cw==",
+      "license": "MIT",
+      "dependencies": {
+        "css-line-break": "^2.1.0",
+        "text-segmentation": "^1.0.3"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/ignore": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",
@@ -6729,7 +6741,6 @@
       "resolved": "https://registry.npmjs.org/text-segmentation/-/text-segmentation-1.0.3.tgz",
       "integrity": "sha512-iOiPUo/BGnZ6+54OsWxZidGCsdU8YbE4PSpdPinp7DeMtUJNJBoJ/ouUSTJjHkh1KntHaltHl/gDs2FC4i5+Nw==",
       "license": "MIT",
-      "optional": true,
       "dependencies": {
         "utrie": "^1.0.2"
       }
@@ -7088,7 +7099,6 @@
       "resolved": "https://registry.npmjs.org/utrie/-/utrie-1.0.2.tgz",
       "integrity": "sha512-1MLa5ouZiOmQzUbjbu9VmjLzn1QLXBhwpUa7kdLUQK+KQ5KA9I1vk5U4YHe/X2Ch7PYnJfWuWT+VbuxbGwljhw==",
       "license": "MIT",
-      "optional": true,
       "dependencies": {
         "base64-arraybuffer": "^1.0.2"
       }