Fix My Expenses GUI fixture normalization

[panDing19]

Problem

Several My Expenses GUI fixtures use shapes that the mobile initializer did not normalize correctly:

• Hex CSS colors such as #1976D2 were later parsed as integers.
• Label-based fixtures could still carry non-normalized account types/colors.
• Multi-container fixtures could contain duplicate transaction ids, causing the wrong record to survive for TGUI51.

Affected tasks

• TGUI30_gmail_scheduler_expense_budget_verify
• TGUI33_sprint_expense_calendar_notes_myexpenses
• TGUI51_incident_dinner_expense_calendar

Fix

• Normalize account type and color consistently before import.
• Merge list-wrapped and multi-container My Expenses fixtures.
• Dedupe accounts/categories/payees and prefer the latest duplicate transaction record.
• Preserve transaction_id through normalization so downstream checks can identify the intended record.

Tests

• uv run pytest tests/test_mobile_gui_init.py -q