Sync Repo-todo from project files

Repo-todo.-.md

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+> Mirrored from `/mnt/DATA/git/pdf-tools/todo.txt`.
+> Origin: `repository`.
+> Active tasks and changing state belong in Gitea issues; this wiki page is durable project context.
+
+---
+Proposed roadmap as milestones
+
+Milestone 1 — “Fast Preview & Thumbnails”
+Outcome: current app feels responsive.
+
+- delete PageList
+Version
+fix thumbnail sizing
+progressive thumbnail rendering - Thumbnail generation: show already when not done completely; cache
+thumbnail cache
+preview next/previous - Flip through preview; tools on preview
+keyboard shortcuts for preview and selection - Keyboard shortcuts (Ctrl+A, Del, arrows to navigate pages, etc.)
+README update for current feature set - README
+
+Milestone 2 — “Real Page Workspace”
+Outcome: pages become editable workspace objects, not just indices.
+
+introduce PageRef
+duplicate selected pages - “Duplicate selected pages” into a new position
+extract selection as new workspace - “Extract selection as new workspace” (open selection as a separate working document)
+command history model
+A sidebar history/command log
+undo/redo - Undo / Redo
+grid/list toggle - A grid/list view toggle
+
+Milestone 3 — “Better Merge & Mobile”
+Outcome: multi-document workflows become natural.
+
+full multi-file merge queue - Full multi-file merge UI (queue merges, reorder incoming files)
+drag PDF into page grid at hovered position - Support for drag-drop PDF into page grid to merge at the hovered position
+long-press drag on mobile - Long-press drag on mobile (custom touch-DnD)
+improved toolbar - UI toolbar
+mobile layout cleanup - Mobile
+
+Milestone 4 — “Structural PDF Editing”
+Outcome: support common non-content-stream PDF edits.
+
+metadata editor - Metadata editing
+crop pages - Crop pages?
+preview tools
+form read/fill/flatten - Form read/fill/flatten
+bookmarks read/edit, probably read first - Bookmarks editing
+annotations read, write later - Annotations read (write optional)
+
+Milestone 5 — “Export, Extraction & Power Tools”
+Outcome: stronger output workflows.
+
+basic text extraction - Basic text extract
+optimize/compress MVP
+Optimize & compress PDF
+encrypted PDF handling, carefully scoped - Encryption / Decryption
+ZIP export for split results
+versioning/release polish