feat(passcode): implement change passcode flow (MW-324)

[sahilshivekar]

Jira Task: 324

Screen recording

Verify old passcode → Create → Confirm → Success dialog → Back to Settings.

change_passcode.mp4

Description

Summary

• Fix “Change Passcode” not triggering.
• Implement full flow: verify current passcode → create new passcode → confirm passcode → save passcode → success dialog → return to Settings.

Changes made ->

• Passcode screen is outside Main_Graph; pass rootNavController to MifosNavHost to support cross-graph navigation.
• Navigation arg: Added INTENTION query parameter (String) and Intention enum (CHANGE_PASSCODE, LOGIN_WITH_PASSCODE, CREATE_PASSCODE) to drive passcode screen state.
• INTENTION defaults to LOGIN_WITH_PASSCODE because rootNavGraph uses PASSCODE_GRAPH startDestination (not PASSCODE_SCREEN).

Other related/connected minor changes ->

• Fix navigating to home screen even after entering wrong passcode
• Fix navigating to home screen even when "Forgot Passcode? Login manually" button is clicked
• For both of the fixes only single line changes are made in MifosNavHost.

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✨ Finishing touches

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