v0.5.5

Added

• Playwright browser test suite: 28 automated tests covering colour resolution, dark mode, semantic token hierarchy, widget rendering, form validation, and interactions.
• placeholder option: pass placeholder to new DiscussWidget({...}) to override the default comment textarea placeholder text.

Changed

• Semantic CSS tokens: all internal shorthand tokens renamed to explicit semantic names (--text-primary, --surface-base, --brand-600, --border-default, etc.). Rename applied at build time with no runtime aliases and no size overhead.
• Comment body text uses --text-secondary for visual separation from the commenter name, which stays at --text-primary.

Fixed

• Dark mode code block bug: <pre> blocks rendered with a near-white background when darkSelector was active.
• Share highlight dark detection now uses this.darkSelector instead of a hardcoded .dark class check.