docs(consumer): record settings cleanup checkpoint

[artemgetmann]

Review Fast Path

• User path fixed: launch plan now records merged PR feat(macos): promote browser and AI settings #628 Settings cleanup instead of treating Browser/Permissions cleanup as untouched.
• Proof: PR feat(macos): promote browser and AI settings #628 merged to main at 1c561be2b6410e48dffada9065bd6b0e6b1aba8e; this docs patch records its scope and remaining polish.
• Shared-state footgun removed: future lanes will not restart the already-merged first-pass Settings structure cleanup.
• Still hurts: Channels, AI access, and Permissions still need copy-density/card-styling polish.

Why This Matters

• The launch plan is the active product tracker.
• UI polish affects beta onboarding, so the plan needs the current truth before Neon/package work resumes.

Scope Boundary

• Docs only.
• Does not change macOS UI code, backend code, Render settings, package scripts, or release assets.

Verification

• git diff --check

AI Assistance

• AI-assisted
• Testing degree: docs-only