- Introduce `navigateRemoteURL` / `showLocalPage` / `showErrorPage` helpers
that centralize remote navigation, watchdog wiring, and error fallback,
replacing the ad-hoc logic inside `loadWindowURLSafely`.
- Show a localized loading page (`loadingPageDataURL`) while a remote URL
is fetching, so the window no longer sits on blank white during slow
navigations.
- Add a 25s remote-load timeout watchdog that switches the window to the
error page when the target never finishes loading, plus an active load
token so stale watchdogs from earlier navigations cannot fire on the
current attempt.
- Track `localPageKind` and `activeTargetURL` per window so blank-page
retries, did-fail-load handlers, and ready-for-detection checks behave
correctly when the window is currently showing a local loading/error
page.
- Escalate the blank-page watchdog: after the retry attempt, if the page
is still blank, surface the error page instead of looping silent
reloads.
- Restyle the error page (drop gradients, use a neutral light/dark token
palette, single primary retry button) and add a dedicated loading page
template with the same look.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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