Rework the full-node Import Key dialog into a safer, Material-consistent, more
capable flow:
- Security: the key is masked by default (Password) with a reveal (eye) toggle,
a DialogWarningHeader "only import a key you own" note, and the buffer is
wiped with sodium_memzero on close and on successful import.
- Progress: import triggers a blocking full-chain rescan; the dialog now shows
"Importing & rescanning — this can take several minutes" with LoadingDots and
disables Import while it runs (no double-submit). Offline shows a "connect a
running node" note and disables Import up front.
- Viewing keys: the classifier gains isViewingKey / isRecognizedImportKey;
importPrivateKey auto-detects a shielded viewing key (zxviews…) and routes to
z_importviewingkey (watch-only) vs z_importkey / importprivkey. The live type
indicator shows Transparent / Shielded spending / Shielded viewing (watch-only).
- Result: on success the imported address is captured from the RPC result and
shown via AddressCopyField.
- Material restyle (OverlayDialogSpec/BlurFloat + TactileButton + Esc) and full
i18n (12 new keys x 8 languages; CJK subset rebuilt).
Verified: rendered on dark + light skins; a seeded zxviews… key shows the masked
field + "Shielded viewing key (watch-only)" indicator.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>