When a user adds a custom ElectrumX server and runs Test Connection,
the server's TLS certificate is automatically captured and pinned
(Trust On First Use). This allows custom servers with self-signed
certificates to work on Samsung/Xiaomi/OnePlus devices.
Changes:
- ElectrumXClient: addPinnedCert(), setDynamicCerts() for runtime
cert management; testServer() now captures server cert PEM and
SHA-256 fingerprint from SSL session
- NamecoinSharedPreferences: persist pinned certs to DataStore
- AppModules: load pinned certs on startup, sync to ElectrumXClient
- NamecoinSettings: custom servers always set trustAllCerts=true
(ElectrumX servers almost universally use self-signed certs)
- UI: shows cert fingerprint in test results, auto-pins on success
- ServerTestResult: new serverCertPem + certFingerprint fields
Flow: Add server → Test Connection → cert auto-captured and pinned →
future connections trust that cert even on Samsung Knox devices.
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