Add accessibility regression tests

[tsouth89]

Fixes #222.

Adds vitest-axe, a shared assertion helper, and checks for quota cards, mini charts, and update banners in the existing Frontend test job. Color contrast is excluded because jsdom cannot measure rendered colors. Focused tests and the production frontend build pass.

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Note

Low Risk
Test-only frontend change with a new devDependency; no production behavior or security-sensitive paths are modified.

Overview
Frontend CI now fails on axe accessibility regressions for quota cards, mini charts, and update banners.

Adds vitest-axe plus a shared expectNoAccessibilityViolations helper (color-contrast disabled because jsdom cannot measure it) and wires the matcher in the existing Vitest setup. Representative renders of PlanStatusCard, SimpleBarChart, and UpdateBanner call that helper.

^{Reviewed by Cursor Bugbot for commit 2c837b5. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add axe-based accessibility regression tests for frontend components

• Adds a shared expectNoAccessibilityViolations helper in accessibility.ts that runs axe and disables the color-contrast rule due to jsdom limitations
• Registers axe matchers globally in the Vitest environment via setup.ts
• Adds accessibility tests to the MiniBarChart, PlanStatusCard, and UpdateBanner test suites
• Behavioral Change: The MiniBarChart, PlanStatusCard, and UpdateBanner test suites now fail when axe detects accessibility violations in their rendered output

^{Macroscope summarized 2c837b5.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 747fcfa and 2c837b5.

⛔ Files ignored due to path filters (1)

• apps/desktop-tauri/pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (7)

• CHANGELOG.md
• apps/desktop-tauri/package.json
• apps/desktop-tauri/src/components/MiniBarChart.test.tsx
• apps/desktop-tauri/src/components/PlanStatusCard.test.tsx
• apps/desktop-tauri/src/components/UpdateBanner.test.tsx
• apps/desktop-tauri/src/test/accessibility.ts
• apps/desktop-tauri/src/test/setup.ts

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