feat: light chip palette with hue-matched text

[nbaed]

Summary

• Switches the chip color palette from saturated FigJam colors to light pastel backgrounds with darker hue-matched text (e.g. light red bg + dark red text, vs. the previous medium-red bg + dark navy text)
• Removes CHIP_OVERRIDES — the Critical special case is now handled by default optionColors on the Priority column instead
• Priority column ships with red/orange/yellow/green as defaults (users can still change per-option in Manage Columns)
• Adds a chipTextColor helper so stored colors that match a palette entry use the hue-matched text rather than generic luminance-based dark/light

Test plan

• Reload widget in Figma — existing dropdown chips should show updated colors
• Add a new widget — Priority column should default to red/orange/yellow/green chips
• Open Manage Columns → change a chip color → confirm picker preview matches chip rendering
• Set a custom hex color → confirm text color auto-computes correctly

🤖 Generated with Claude Code