fix: correct table sizing and drawer accessibility

[inureyes]

Summary

• Clamp initial and restored DataTable widths to explicit minimums, apply those minimums to header and body cells, and align both from the logical start while preserving physical alignment options.
• Start Drawer focus management after its visible state commits, keep the latest close callback without resetting focus, and generate unique default accessible IDs.
• Add focused sizing, alignment, focus, dismissal, trap, restoration, and accessible-identity regressions and prepare 0.1.0-alpha.20.

Test plan

• pnpm run verify (561 tests, build, boundary checks, and packed artifact inspection)
• Install the packed tarball into a clean consumer, then typecheck, build, and verify bundled component styles

Closes #43