Add bundled TTF fonts, page geometry, column allocator and render model

Static TTF fonts (IBM Plex Sans/Mono, Noto Devanagari/Kannada) with a
fontkit-generated manifest, a verifier and OFL licences. Every family
registers a normal and italic source so fallback stacks cannot throw.
Adds A4/Letter geometry with margin presets, an exact column allocator,
deterministic Indian-grouping money and date formatting, text sanitising
and a pure buildRenderModel.

package-lock.json

@@ -12,7 +12,6 @@
         "@carbon/react": "^1.117.0",
         "@carbon/styles": "^1.116.0",
         "@ibm/plex": "^6.4.1",
-        "@napi-rs/canvas": "*",
         "@react-pdf/renderer": "^4.9.0",
         "@tauri-apps/api": "^2.12.1",
         "@tauri-apps/plugin-dialog": "^2.8.1",
@@ -27,6 +26,7 @@
         "@types/react": "^19.2.0",
         "@types/react-dom": "^19.2.0",
         "@vitejs/plugin-react": "^5.2.0",
+        "fontkit": "2.0.4",
         "pdfjs-dist": "6.4.299",
         "sass": "^1.105.1",
         "typescript": "^5.9.3",