feat(export): refactored PDF report with line-by-line rendering and keyword coverage

- moved PDF generation from ReportExport.svelte to engine/scorer/report.ts
- added classification.ts for score grading logic
- fixed letter spacing bug by rendering text line-by-line instead of passing arrays to jsPDF
- added keyword coverage section with matched/missing keyword boxes sorted by frequency
- fixed footer layout: disclaimer constrained to 68mm, centered attribution link
- dynamic section numbering based on content presence
- cleaned up scoring component imports

Author: sunnypatell

package.json

@@ -28,7 +28,7 @@
 		"bits-ui": "^2.16.0",
 		"compromise": "^14.14.3",
 		"firebase": "^12.9.0",
-		"html2pdf.js": "^0.14.0",
+		"jspdf": "^4.2.0",
 		"mammoth": "^1.8.0",
 		"motion": "^12.0.0",
 		"motion-sv": "^0.1.10",