Improve browser pairing instructions and message copying

[ka-wah]

Summary

• Wrap fenced text blocks such as browser invitations within the message width. Ordinary chat text wrapping is handled by #430, now on main.
• Add a subtle copy action to each text message; fenced code blocks already have their own copy action.
• Show each message's copy action on hover or keyboard focus.
• Use gsv.space/browser for extension downloads, with a validated release parameter for invitations.
• Explain how to find Your GSV under the browser's Extensions menu when its toolbar icon is hidden.
• Update the feedback dialog copy and show a read-only version in PR previews, where sending is unavailable.

Deployment dependency: gsv.space PR #10 must be deployed before this PR's browser links are live.

The existing device invitation contains the gateway address and a 256-bit secret. A WhatsApp-length code needs a separate pairing protocol design and coordinated gateway, extension, and CLI changes.

Validation

• npm run lint
• cd web && npm run check
• cd web && npm run test:run (1,012 passing)
• cd web && npm run build
• npm run gsv:check && npm test --workspace packages/gsv
• Gateway typecheck and pairing tests (7 passing)
• npm run docs:check

Docs: gsv-manual PR deathbyknowledge/gsv-manual#31

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-13T09:16:36.846870Z	1100a25	Manual request

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[github-actions]

Preview removed.

[ka-wah]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: 1100a2588b

ℹ️ About Codex in GitHub

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