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Clipboard-copied address has no leak-vector warning for MDM/shared devices #44

Description

@ndii-dev

Beyond simply adding an auto-clear timer (covered in a related issue), there's no user education at all in handleCopy (app/auth/create.tsx) about clipboard as an attack surface — other apps with clipboard-read permission (increasingly restricted by OS but still relevant, and fully unrestricted on many Android builds/MDM-managed corporate devices) can read what's copied. This is lower severity for a public key than a secret, but the copy pattern here is precedent for whatever copies a secret/mnemonic later.

Definition of done:

  • User-facing microcopy warning shown on first copy action (dismissible, not nagging every time)
  • Documented as a required pattern for any future "copy secret/mnemonic" feature, escalated beyond just a warning (e.g. combined with the auto-clear timer, non-negotiable there)
  • No regression to the copy UX for the common, lower-risk public-key case

Before opening a PR for this issue, read CONTRIBUTING.md.

This is not a starter-issue. The Definition of done above is the full
acceptance criteria, not a subset to sample from — a PR that addresses part
of it is an unfinished issue, not a smaller one. Your PR must include, in
the PR description itself:

  • Root cause / design-decision rationale in your own words — not a restatement of this issue
  • Every Definition of done bullet above addressed explicitly, with a one-line note on how
  • Evidence the code actually runs: pasted test/build output, a screen recording or before/after screenshots for UI changes, or real (non-mocked) logs for network/contract-facing work
  • New or updated tests included and shown passing (paste the output)
  • Any adjacent/related behavior this issue calls out re-verified, not assumed unaffected

PRs missing these will be sent back before review, not reviewed and rejected — please do this up front.

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