PR 28814 real dev verification, Linux Boat VM
baseline github/main e6e2ab05cceb3f8245e87f8499d4891f27de33cb
original PR a926a8a5c804c74a39b110e704c1cb559caa03d3
fixed head 015a6eb5ccb44d52bd67be3c23aedc475c39a955
Playwright from repo dependencies, /usr/bin/google-chrome for web; Electron 44.10.0 desktop Browser panel over CDP.
Real Codex gpt-6.1-sol turns created the documentation site and inspected its source through the running web app.

MAIN: entered /start; /guide loaded, but desktop:preview-navigate rejected:
  cause: Error: ERR_ABORTED (-3) loading 'http://127.0.0.1:4318/guide'
      at rejectAndCleanup (node:electron/js2c/browser_init:1:96591)
      at WebContents.navigationListener (node:electron/js2c/browser_init:1:96871)
      at WebContents.emit (node:events:526:24) {
    errno: -3,
    code: 'ERR_ABORTED',
    url: 'http://127.0.0.1:4318/guide'
  }
}


ORIGINAL PR: /start -> /guide without toast. Unsaved /draft -> /about stayed on /draft without toast (regression).

FIXED: /start -> /guide, loading=false, no navigation-error toast.
FIXED: activated and typed into draft. /draft -> /about was blocked; note remained, navigation error surfaced:
  cause: Error: ERR_ABORTED (-3) loading 'http://127.0.0.1:4318/about'
      at rejectAndCleanup (node:electron/js2c/browser_init:1:96591)
      at finishListener (node:electron/js2c/browser_init:1:96753)
      at WebContents.failListener (node:electron/js2c/browser_init:1:97039)
      at WebContents.emit (node:events:526:24) {
    errno: -3,
    code: 'ERR_ABORTED',
    url: 'http://127.0.0.1:4318/about'
  }
}

FIXED: clicked Save note; observed saved note in localStorage, then /about loaded.
FIXED: entered refused port 4319; ERR_CONNECTION_REFUSED and navigation-error toast surfaced:
  cause: Error: ERR_CONNECTION_REFUSED (-102) loading 'http://127.0.0.1:4319/'
      at rejectAndCleanup (node:electron/js2c/browser_init:1:96591)
      at WebContents.finishListener (node:electron/js2c/browser_init:1:96753)
      at WebContents.emit (node:events:526:24) {
    errno: -102,
    code: 'ERR_CONNECTION_REFUSED',
    url: 'http://127.0.0.1:4319/'
  }
}


BLACKSMITH existing regression assertion before scoped fix:
[01:39:38.518] ERROR (#1): Error [AssertionError]: expected false to be true // Object.is equality
⎯⎯⎯⎯⎯⎯⎯ Failed Tests 1 ⎯⎯⎯⎯⎯⎯⎯
 FAIL   @t3tools/desktop  src/preview/Manager.test.ts > PreviewManager > treats a load superseded by a page redirect as a successful navigation
AssertionError: expected false to be true // Object.is equality
      Tests  1 failed | 59 skipped (60)
BLACKSMITH final fix: 60 Manager tests passed; vp run build:desktop passed.
check:changed summary
  pass  format  0.2s
  pass  lint  0.4s
  pass  knip 1/2  5.5s
  pass  knip 2/2  11.5s
  pass  typecheck (2 packages)  1.6s
  pass  test (1 files)  6.2s
  CI also runs: full test suites, build
  unused patch check skipped: no dependency files changed
  pass not cached: files changed during the run


Same-url abort regression first failed on f1d4bff; passes with will-prevent-unload guard.
Actual final runtime transcript (CDP drove the real app and native guest, no mocked responses):
PR redirect: {
  url: 'http://127.0.0.1:4318/guide',
  title: 'Navigation guide · Waypoint',
  loading: false
}
notifications [ '', '' ]
pages [
  't3code-dev://app/#/d4d2fa16-077d-4799-95fa-4c302d9333f9/d1edb5e7-7e98-47d9-988a-8546f026f022',
  'devtools://devtools/bundled/devtools_app.html?remoteBase=https://chrome-devtools-frontend.appspot.com/serve_file/@a2a39e9d73ee31821289f871b319aa572faef0de/&can_dock=&toolbarColor=rgba(223,223,223,1)&textColor=rgba(0,0,0,1)&experiments=true'
]
webviews [ { url: 'http://127.0.0.1:4318/draft', id: 3 } ]
draft {
  result: {
    type: 'string',
    value: '{"note":"nnavigation must preserve this unsaved noteavigation must preserve this unsaved note","active":true,"status":"Unsaved changes"}'
  }
}
main blocked URL http://127.0.0.1:4318/draft
saved: {
  result: {
    type: 'string',
    value: '{"status":"Saved in this browser","note":"nnavigation must preserve this unsaved noteavigation must preserve this unsaved note","saved":"nnavigation must preserve this unsaved noteavigation must preserve this unsaved note"}'
  }
}
saved draft can leave for /about
refused error: [
  '',
  'Could not open this address\n' +
    '\n' +
    `Error invoking remote method 'desktop:preview-navigate': PreviewOperationError: Desktop preview operation failed: navigate.loadURL (tab ["d4d2fa16-077d-4799-95fa-4c302d9333f9","d1edb5e7-7e98-47d9-988a-8546f026f022","7f0883bb-f7a6-4b82-91b7-78075497b616","tab_1_7f0883bb-f7a6-4b82-91b7-78075497b616"], WebContents 3)`
]
reloading committed navigation http://127.0.0.1:4318/guide?reload=1793585785197
same-url reload {
  url: 'http://127.0.0.1:4318/guide?reload=1793585785197',
  loading: false
} errors 0

Not verified: macOS/Windows Electron, native iOS/Android, private OIDC sign-in service, downloads, manually stopped loads, relay/tunnel modes.