PR: https://git.cafe/pingdotgg/t3code/pulls/32801
baseline: github/main e4d86abca9
original head: 296ab937ecdca147bd296bf300e0d40da28697e7
verified fixed head: 9ee800feb15e66cd292fd495090e55d7a8962b04

Runtime: isolated dev homes, one dev server at a time, repo Playwright + /usr/bin/google-chrome.
Main: server 16733, web 8693, /home/user/main/.t3.
PR: server 13773, web 5733, /home/user/t3code/.t3.
Real Codex gpt-6.1-sol turns created and inspected /home/user/copy-workbench through the web client.
The workbench is a real git repo, commit 5dd83b9, Node HTTP app on localhost:47831.
All copy interactions were clicks and keys on the real streamed Browser canvas.

Main, click Copy text (writeText after awaiting permissions query):
  page: Text copied successfully.
  local clipboard after 6 seconds: previous clipboard marker
  copy offers: 0
  paste: previous clipboard marker
  ordinary Ctrl+C: clipboard verification 32801
  custom Ctrl+C: intended custom text

Original PR:
  before accepting copy offer: previous clipboard marker
  after accepting copy offer: clipboard verification 32801
  custom Ctrl+C: unrelated transfer text (regression)

Fixed PR after reinstall and clean dev restart:
  before accepting writeText offer: previous clipboard marker
  after accepting: clipboard verification 32801
  custom Ctrl+C: intended custom text
  dismiss offer: previous clipboard marker
  legacy execCommand offer before accepting: previous clipboard marker
  legacy offer after accepting: clipboard verification 32801
  empty click after 5.5 seconds: unchanged without copy; offers 0
  ordinary Ctrl+C: clipboard verification 32801; offers 0
  release control then click after 5.5 seconds: control released marker; offers 0

Remote Blacksmith regression check:
  vp test run apps/server/src/preview/ServerBrowser.copies.test.ts
  before fix: 5 failed, 21 passed; expected page copy, received unrelated item
  after fix, focused server checks: 3 files passed, 93 tests passed

Remote Blacksmith:
  vp run check:changed github/main
  pass format; lint; knip 1/2; knip 2/2; graphql (apps/server);
  typecheck (9 packages); test (6 files); react compiler (4 files).
  Explicit github/main supplies the base because the task runner has a shallow source snapshot.

Not exercised: native iOS/Android, packaged Electron, macOS/Windows, external websites,
non-loopback HTTP LAN clipboard fallback. No performance claim.