1. buildRequestHeaders: UTF-8-encode Basic-auth credentials before btoa()
so non-ASCII usernames/passwords don't throw (Hermes' btoa is Latin1-only
and the throw was an unhandled rejection that hung the connect spinner).
2. diagnostics classify(): check root.ok (server reachable) before
!internet.ok, so a reachable-but-failing server (e.g. wrong auth) is no
longer misdiagnosed as "no internet" just because the public-internet
probe also failed (captive portal, Tailscale-only network, etc).
3. sdk.ts createClient: strip trailing slashes from baseUrl once, so a
trailing-slash URL from Advanced mode / Edit screen doesn't produce a
double slash on every request path.
4. add.tsx / [id].tsx: wrap addConnection/updateConnection in try/catch so
a SecureStore failure after a successful test resets the spinner and
shows an alert instead of hanging forever. Adds
connection.shared.alerts.saveFailedTitle/saveFailedMessage (en + zh-Hans).
5. add.tsx / [id].tsx: build the diagnostics probe's auth with buildAuth()
instead of a hand-rolled expression, so the probe reproduces the real
request's credentials (previously Quick Connect's password-only case
sent no auth to the probe at all).
6. add.tsx handleQuickConnect: stop sending the shared `username` state,
which could carry a stray value typed earlier in Advanced mode and
silently override the "opencode" default after "Back to Quick".
Claude-Session: https://claude.ai/code/session_01T12AhSnQVrSxNnvwfCx2z6
Co-authored-by: engineer <engineer@macbookpro.lan>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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