Kyle Isom 199d7a20f7 Add indented bullet reflow test, improve undo edge cases, and bump version ...

- Added `test_reflow_indented_bullets.cc` to verify correct reflow handling for indented bullet points.
- Enhanced undo system with additional tests for cursor adjacency, explicit grouping, branching, newline independence, and dirty-state tracking.
- Introduced external modification detection for files and required confirmation before overwrites.
- Refactored buffer save logic to use atomic writes and track on-disk identity.
- Updated CMake to include new test files and bumped version to 1.6.4.

2026-02-16 12:44:08 -08:00

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