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mnemonic: support all standard BIP39 word counts - #314

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mnemonic: support all standard BIP39 word counts#314
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Extend Jade's mnemonic support from 12 and 24 words to all standard BIP39 lengths: 12, 15, 18, 21, and 24 words.

This centralizes word-count and entropy-length validation and applies it to mnemonic generation and restoration, passphrase-protected persistence, recovery phrase UI, final-word calculation, SeedQR and CompactSeedQR handling, and ur:crypto-bip39 imports. BIP85 remains limited to 12 and 24 words.

Adds fixed BIP39 vectors and round-trip coverage for derivation, storage, text, SeedQR, and CompactSeedQR imports, including rejection of non-standard 27 and 30-word libwally extensions.

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