a11y | Bump design-system for D12 dark stroke tokens

[BrianGenisio]

Summary

Bumps design-system to learn_bespoke-design-system main at 6ab762a so ChatCPT picks up D12 (dark-adapted --Colors-Stroke-* tokens and the tertiary button border).

Changes

Submodule c8bc490 → 6ab762a (DS #27).

Dropped the app.css override of --Colors-Buttons-Tertiary-Default. The DS dark block now sets Neutral-1100.

The sidebar rest pill still needs a stronger rest color than Stroke-Light (hairline at 0.5 opacity). It now uses Stroke-Stronger in dark, which is the same Neutral-900 as the old hardcoded value.

wave-4-plan.md: D12 → DS PR #27.

Test plan

• npm test (235 passed)
• Dark mode: tertiary buttons (Cancel, etc.) have a dark border, not a near-white one
• Dark mode: sidebar, markdown rules, inputs, and tables use dark hairlines
• Dark mode: resizer grip is still visible at rest (same as before)
• Light mode: borders and the rest pill unchanged

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📥 Commits

Reviewing files that changed from the base of the PR and between 17095e8 and 3a835c5.

📒 Files selected for processing (3)

• a11y-audits/8-5-26/wave-4-plan.md
• design-system
• public/app.css

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