TAPSIGNER backup steps test 52c3086

Test build for clearer TAPSIGNER backup flow wording.\n\nChanges:\n- Explains that encrypted TAPSIGNER backup is a separate authenticated NFC action.\n- Tells users to enter the TAPSIGNER PIN, choose the .aes file location, then tap the card again.\n- Adds the same warning to TAPSIGNER multisig cosigner setup before funding.\n\nVerification:\n- ./gradlew testDebugUnitTest --tests 'net.clench.wallet.ui.components.TapsignerTapProtocolTest' --tests 'net.clench.wallet.domain.model.HardwareWalletTypeTest' compileDebugKotlin\n- ./gradlew assembleDebug assembleRelease\n- git diff --check