Add a "Backup & keys" section to the lite Settings page, shown only for an open
wallet, wiring the M4 controller backup/import surface into the GUI:
- "Show seed" / "Show private keys" -> exportSeed() / exportPrivateKeys();
the revealed secret is displayed read-only (TextWrapped, no extra copies) with
Copy and "Hide & wipe" controls.
- "Import key" (password input) -> importKey() (auto-detects WIF vs shielded);
do_import_sk just records the key + saves (no synchronous rescan), so this is
safe on the UI thread — history appears after the next sync.
Secret hygiene: the revealed-backup buffer is sodium-wiped via
secureWipeLiteSecret on hide, on a new export (overwrite), and if the wallet
closes while revealed; each export also wipes the controller's result copy; the
import input buffer is zeroed immediately after submission.
Lite app + full-node variant build/link clean; controller methods already
covered by testLiteWalletControllerM4; hygiene clean. GUI behavior itself isn't
auto-verifiable here.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
DanS
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