fix(cli): honor text overflow opt-outs

[miguel-heygen]

Summary

• suppress clipped_text, text_box_overflow, and text canvas overflow under data-layout-allow-overflow
• honor documented per-element data-layout-bleed for intentional text crops
• add regression coverage for CSS ellipsis truncation

Reproduction

Confirmed on published 0.7.56: intentional text-overflow: ellipsis emitted both clipped_text and text_box_overflow despite the documented opt-outs.

Tests

• bun run --cwd packages/cli test src/commands/layout-audit.browser.test.ts
• bun run --cwd packages/cli typecheck
• pre-commit lint/format/fallow/typecheck