ztk v0.2.2

Fixes

• Fixed the ztk stats summary meter overflowing past the right border in terminal layouts like Ghostty.
• Added a regression test to keep boxed summary rows aligned at a fixed width.

Verification

• zig test src/stats_render.zig
• zig build test
• zig build -Doptimize=ReleaseSmall

Closes #4.