PR https://git.cafe/pingdotgg/t3code/pulls/22002
GitHub https://github.com/pingdotgg/t3code/pull/22002
main: 5808469018 (github/main fetched this turn)
PR: b596b9de41e5ae4a7d570c02d764d46fcf087a48 (exact unchanged head)
Linux, real Electron 44.9.3, Playwright 1.60.0, Codex gpt-6.1-sol through local proxy.

Created a real git repository at /home/user/cache-verification.
Created its T3 project and thread through the UI. A real Codex turn wrote the
storage diagnostic page. Desktop main and PR each completed a real Codex turn
reading that file. No database fixtures, mock providers, or direct storage edits.
The dev runner automatically copied an empty-thread project into main at startup;
that copied project was not used. All scenario state was created through the UI.

main: vp i; vp run dev (background, worktree .t3); remote build:desktop;
launched real Electron desktop against its Vite renderer with isolated homes.
Page Store data writes Cache API takeover-cache, /cached-response=preserved-response,
localStorage takeover-value=preserved-local, cookie takeover-cookie=preserved-cookie.
Settings > Browser > Default options > Clear cookies and cache > Clear data.
Read data after clear:
  caches.keys(): ["takeover-cache"]
  cached response: preserved-response
  localStorage takeover-value: null
  document.cookie: (empty)
Original bug reproduced.

PR: vp i; vp run dev --home-dir /tmp/pr22002-web-pr --no-seed (background);
[dev-runner] serverPort=13773 webPort=5733. Remote build:desktop passed.
Real Electron desktop backend on port 16806 with isolated T3 and Chromium homes.
Settings > Integrations > Default options > Clear cookies and cache > Clear data.
Read data after clear:
  caches.keys(): []
  cached response: null
  localStorage takeover-value: null
  document.cookie: (empty)
Second profile Untouched, same origin and data, after clearing Default:
  caches.keys(): ["takeover-cache"]
  cached response: preserved-response
  localStorage takeover-value: preserved-local
  document.cookie: takeover-cookie=preserved-cookie
Settings > Integrations > Untouched options > Remove profile and data > Remove profile.
Read data in its still-open native tab:
  caches.keys(): []
  cached response: null
  localStorage takeover-value: null
  document.cookie: (empty)
Default tab still open, empty storage as before.

Both native app pages and settings were driven through Playwright/CDP. The native
webview buttons and visible output were accessed over their CDP target. The clear
and remove actions used the actual settings UI and desktop IPC path.

Remote Blacksmith: vp test run src/preview/BrowserSession.test.ts in apps/desktop:
  Test Files 1 passed (1), Tests 7 passed (7).
Both desktop builds passed. Existing head CI: 28 successful, 0 failing, 0 pending.
No source changes, commits, or pushes needed.

Startup limitations encountered: libsecret development headers missing on remote
build workers (installed and builds passed); first Electron startup hung until
--password-store=basic; the built production renderer failed in icons chunk with
undefined.map, so final verification used the actual Vite development renderer;
concurrent services overwhelmed the VM and were stopped before final verification.
An initial root-checkout dev invocation selected the default T3 home, then was
stopped during dependency warmup and replaced with an explicit isolated home.

Not verified: macOS, Windows, native iOS/Android, remote/relay/tunnel, tab-menu Clear
cookies, service-worker and IndexedDB cleanup, HTTP-cache eviction, production
renderer startup, persistence across full app restart. The server-hosted browser
clear implementation is separate and was not used as proof of this desktop fix.