…rn type

Commit 68e0452 introduced a bug in `get_result()` that caused all KWallet
password lookups to fail. The method was changed to return `KWalletResult`
enums, but the implementation had two critical flaws:

1. `KWalletResult.from_variant(result.arguments())` passed the entire
   arguments list instead of `result.arguments()[0]`. Since `KWalletResult`
   can only be constructed from integers 0, 1, or 2, passing a list always
   raised ValueError and returned `KWalletResult.INVALID`.

2. The abstraction was fundamentally wrong - DBus methods return different
   types (bool for `isEnabled`/`hasEntry`, str for `readPassword`/`networkWallet`,
   int for `open`), but everything was being converted to a 3-value enum.

This caused:
- `get_password()` to always return None (hasEntry check always failed)
- `try_unlock()` to always prompt for a new wallet name
- Wallet handles to be lost (output.value gave enum value, not actual handle)

Fix: Restore `get_result()` to return raw DBus values (`arguments[0]`)
while keeping the improved error handling. Update all call sites to check
for `None`/truthy values instead of enum comparisons.

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Co-Authored-By: Claude Opus 4.5 <[email protected]>