Issue 072: Ensure ThemeToggle and CSS variables remain accessible for contrast-sensitive views

[orunganiekan]

Category: Frontend
Complexity: 200 points
Labels: frontend, wave-200

Context

useTheme, ThemeToggle, and index.css theming exist; root script audit:contrast currently aliases typecheck only.

Problem

Critical status colors (overdue, paused, errors) may fail contrast in one theme.

Goal

Audit status color tokens for light/dark, fix variables, and add a lightweight contrast check test or script meaningful beyond typecheck.

Scope

Includes: CSS variable fixes + tests/script.
Does NOT include: full design system rewrite.

Implementation Guidelines

• Files: index.css, ThemeToggle.tsx, status components, optionally package script.

Acceptance Criteria

• Status colors meet agreed contrast target
• Toggle persists
• Test/script fails on regressions

Validation

Run new contrast check + Vitest theme tests.

PR Expectations

The PR should include:

• Token fixes + check

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