feat: v1.2.0 - split Pages deploy to separate workflow, fix tag deployment issue

fix(ci): checkout main branch for Pages deployment to satisfy branch restriction

chore: bump version to 1.1.1

fix: open GitHub releases page in browser when update check fails

fix: update check fallback to tags API when releases returns 403

fix: center settings content area, widen max-width to 640px

fix: GitHub API 403 (add User-Agent header), redesign About page layout

feat: add About page with version check, GitHub/website links

fix: export shows file path and opens folder, improve re-analyze button style

fix: replace HTML5 file handling with Wails native for real file paths and proper PDF extraction

feat: add parsed content preview tab showing what AI actually sees

fix: real delete synced to backend, re-analyze re-extracts PDF content

fix: replace broken PDF parser with ledongthuc/pdf for proper Chinese text extraction

feat: add batch re-analyze and export buttons to resume list

fix: validate AI config before analysis, remove outdated design docs