v0.3.1

[0.3.1] - 2026-03-02

• Added Edit -> Go To Line... with Ctrl+G and Scintilla SCI_GOTOLINE navigation,
  including 1-based line input prefilled from the current caret line and clamped to file bounds.
• Completed core Find/Replace behavior with standard keyflow:
  Ctrl+F, Ctrl+H, F3, Shift+F3, wrap-around, match case, whole word,
  and Replace now advancing to the next match after replacement.
• Kept Replace All as a single undo step via grouped Scintilla undo actions.
• Fixed CI clippy gating issue (collapsible_if) so cargo clippy -- -D warnings
  passes in GitHub Actions.