Root cause (same class as the camera bug): capacitorAmberSigner.ts used
`await import('nostr-signer-capacitor-plugin')`, but that package is marked
external in vite.config.ts and the native build uses inlineDynamicImports, so
the bare specifier survives in the APK bundle and the Android WebView can't
resolve it at runtime. The import threw, getPlugin() returned null, and every
Amber signing op — including the Blossom upload auth event that a Crew logo
upload needs — failed with "Capacitor Amber plugin not available".
Fix: access the native signer via Capacitor's registerPlugin('NostrSignerPlugin')
from the bundled @capacitor/core, and reimplement the plugin's thin JS wrapper
logic directly against the native bridge (options-object API per the plugin's
main source). This removes the broken dynamic import entirely and is version-
independent as long as the native plugin is registered. Covers both native
Amber login (getAmberPublicKeyViaPlugin) and all signing/encryption paths.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
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