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Added

Security

• Argon2id password hashing — replaces plain SHA-256; existing passwords are upgraded automatically on the first successful login
• Change master password — re-derives the encryption key and re-encrypts every note and version snapshot with the new password
• Auto-lock — configurable idle timeout (5 / 10 / 30 / 60 min); the cipher is cleared in memory and re-authentication is required to resume
• Failed-attempt limit — app closes after 5 consecutive wrong passwords
• HMAC integrity check — on startup, an HMAC (keyed with the derived encryption key) of all note ciphertext is compared against the stored value; a mismatch triggers a tamper warning
• Encrypted database backup — copy the SQLite file to any path via Settings or the import toolbar button

Editor

• Find & Replace (Ctrl+H) — floating dialog with prev / next / replace / replace all and a case-sensitive toggle
• Live word & character counter — updates in real time in the status bar below the editor
• Line / column indicator — current cursor position shown in the status bar
• Insert date & time (Ctrl+Shift+D) — inserts YYYY-MM-DD HH:MM:SS at the cursor
• Line number gutter — optional; toggle from the right-click dock context menu
• Read-only mode — per-note; toggle via note context menu; shows [READ-ONLY] in the status bar
• Print (Ctrl+P) — prints the rendered markdown preview via the system print dialog

Organisation

• Tags — attach multiple tags to any note; filter the sidebar list by tag via the tag combo box
• Pin notes — pinned notes always sort to the top and show a ★ indicator
• Archive — hide old notes without deleting them; view them in the Archived filter
• Trash / soft delete — Delete now moves notes to trash; permanent deletion requires a second confirmation from within the Trash view; 30-day auto-cleanup (configurable)
• View filters — All / ★ Pinned / Archived / Trash toggle buttons in the sidebar
• Sort options — last updated, creation date, title A → Z, title Z → A
• Rename note — via the right-click context menu

Export & Import

• Export the current note as Markdown (.md), HTML (.html), or plain text (.txt)
• Import a .txt or .md file from disk; title is auto-deduplicated if it already exists
• Manual database backup from the Settings dialog

History

• Version history — up to 20 snapshots per note, saved on Ctrl+S or when navigating away; deduplicated so unchanged saves don't create extra entries
• Restore version — preview any snapshot in the Version History dialog and restore it to the editor with one click

UI & UX

• Statistics dialog — note counts (total / pinned / archived / trash), tag count, saved versions, oldest note date, last-updated date
• Settings dialog — auto-lock timeout, trash auto-cleanup interval, change password, backup now
• Custom-styled context menu — dark background, gold hover, rounded corners, styled separators and submenus, matching the app theme
• Dynamic status-bar corners — the bottom corners of the status bar round to match the window frame when the editor dock occupies a window corner; recomputed on resize and dock moves
• Markdown preview now uses fenced_code, codehilite, tables, and toc extensions
• Sidebar controls — sort dropdown and tag-filter dropdown above the note list
• Title-bar quick-action buttons — stats, settings, import, lock (Ctrl+L)
• Confirm-password field on first-run password creation
• Remaining-attempts indicator in the password dialog after the first wrong attempt

Changed

• Delete key now moves notes to trash instead of permanently deleting them — permanent deletion only happens from within the Trash view
• Password hashing upgraded from SHA-256 to Argon2id; migrates silently on first login
• Editor widget switched from QTextEdit to QPlainTextEdit — better performance on long documents and required for the line number gutter
• Markdown preview requires Pygments for syntax highlighting in fenced code blocks
• Database schema extended with new tables (tags, note_tags, note_versions, settings) and new columns (pinned, archived, in_trash, trash_date) — existing v1.0.0 databases are migrated automatically with no data loss
• requirements.txt — added argon2-cffi and Pygments

Fixed

• Database indices added for title, updated_at, pinned, archived, in_trash, note_id (on versions and tag joins) — addresses slow list loads on large note collections