KitKat fill workflow

### Checks

- [x] I have read the Wiki, searched the open issues, and still think this is a new bug.

### Explain the problem clearly and succinctly:

The form-filling workflow on KitKat devices, such as the Magikeyboard, does not work if you go through the authentication process.

### Describe what you expected to happen:

The problem stems from the retention of intent data in KitKat devices. The issue will not be resolved because older phones will no longer be supported once the minimum SDK version is 21.

### KeePassDX version:

4.4.0_beta03

### Build:

Libre, Free

### Database version:

_No response_

### File provider (`content://` URI)

_No response_

### Android version:

_No response_

### Android device:

_No response_

### Additional context:

_No response_

The report names no source file, test, or reproducible device details; begin by checking the KitKat form-filling and authentication entry points alongside the project's minimum-SDK support policy. Done would require a maintainer-confirmed reproducible fix or an explicit decision that unsupported KitKat behavior needs no change.

Written by the indexing model from the issue text.