v0.3.0

[0.3.0] - 2026-03-01

• Implemented Notepad++-style remember_session + session_snapshot_periodic_backup
  behavior with default-on periodic backups and no save prompts on exit when enabled.
• Added crash-resilient atomic writes for backup and session files
  (ReplaceFileW with MoveFileExW fallback), plus startup cleanup for stale temp files.
• Implemented backup-first restore semantics for dirty tabs at shutdown and full-tab
  session restoration (named and untitled documents).
• Added global View menu with checkable toggles for Word Wrap and Always On Top,
  with persisted settings and startup re-application.
• Upgraded find/replace internals to SCI_SEARCHINTARGET-based search with grouped
  Replace All undo behavior and Notepad++-style replace flow.
• Updated status bar fields to show authoritative editor state:
  Ln/Col, Sel, EOL, ENC, and dirty indicator.
• Added Help -> About Rivet modal with version, git SHA, build UTC, source URL,
  and local data directory, including copy-to-clipboard action.
• Added build metadata injection in build.rs
  (RIVET_VERSION, RIVET_GIT_SHA, RIVET_BUILD_UTC, RIVET_SOURCE_URL).
• Hardened CI with separate fmt, clippy, test, and scheduled RustSec cargo audit
  workflow jobs.
• Added release compliance assets:
  NOTICE.txt and THIRD_PARTY_NOTICES/Scintilla-Lexilla-License.txt,
  and included them in portable + installer packaging.