- Add CapacitorAmberSigner: a full NostrSigner implementation backed by
the native nostr-signer-capacitor-plugin (login, signEvent, nip04,
nip44 all go through Amber via native Android intents)
- LoginDialog: on Capacitor, call getAmberPublicKeyViaPlugin() directly
instead of the intent:// URL redirect — returns a Promise, no
callback URL or polling needed. Shows clear error if Amber not installed.
- useCurrentUser: on Capacitor amber logins use CapacitorAmberSigner
so every publish/sign goes through the plugin, not window.location.href
- Web/PWA path unchanged — still uses URL redirect + AmberSigner
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
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