feat(friends): cardstock texture behind the add-friend dialog

[scotej]

Summary

The add-friend dialog read as bland — adds a cardstock texture: a whisper-quiet graph-paper grid on the 24px section rhythm plus a faint accent wash bleeding from the top edge. Fits the study-app identity (graph paper) while staying inside the calm direction.

• Defined once as .texture-cardstock in src/design/index.css, built entirely from the live theme variables (--border-subtle / --accent-muted via color-mix), so dark/light themes and future palette edits flow through untouched.
• Static background layer only — DESIGN-SYSTEM §6 motion rules and the reduce-motion kill switch are unaffected.
• DESIGN-SYSTEM §5 records the sanctioned deviation (user-requested) and points any further decorative surface back at §7 rule 3.
• check-contrast compares token pairs, not rendered layers, so the color-mix strengths are deliberately whisper-quiet (grid at 55% of an already-hairline border color; wash at 10% of accent-muted) to keep worst-case composites behind text-muted comfortably above AA.

Stacked on #84 (rebased onto main after its merge).

Testing

npm run build, lint, test (776), check-tokens, check-strings, check-contrast all green. Existing AddFriendDialog stories render the texture for the axe gate.

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0f594fb1-dc11-47b9-a417-1f2d5ab14cda

📥 Commits

Reviewing files that changed from the base of the PR and between 4ebfed8 and 93b234d.

📒 Files selected for processing (3)

• DESIGN-SYSTEM.md
• src/design/index.css
• src/features/friends/AddFriendDialogView.tsx

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch feat/add-friend-texture

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