Closes #2016

This PR fixes a bug where transaction forms were showing all categories regardless of transaction type (income or expense).

Changes

• Fixed the category dropdown to only show relevant categories:
  • Income categories when creating income transactions
  • Expense categories when creating expense transactions
• Created a shared transaction type tabs component for consistent navigation between expense, income, and transfer forms
• Fixed issue where navigating from the transfer form to the income form wasn't working correctly
• Enhanced Account::TransactionsController to filter categories appropriately
• Fixed minor formatting and whitespace issues in some files

Implementation Details

The implementation filters categories in the controller layer while maintaining a clean user interface for navigating between different transaction types. By moving the filtering logic to the controller and creating a shared navigation component, we've addressed the issue while also maintaining code quality.

Testing

I've manually tested the changes to verify:

• Only income categories appear when creating income transactions
• Only expense categories appear when creating expense transactions
• Navigation between the different forms works correctly

Note: There were some failing tests in the suite when running the tests on my dev container, but these failures are also present on the main branch before doing any changes; therefore I assume they are unrelated to the changes in this PR.

For Discussion: Potential UI Improvements

While working on this fix, I noticed some opportunities for further improving the transaction forms:

1. Enhanced Category Dropdown: Currently, the category dropdown shows plain text names. Would it make sense to display categories with their corresponding colors and icons (similar to how they appear in the categories management section)? This would provide visual consistency throughout the app and make it more visually appealing. I noticed that in the Figma mobile designs we already have something similar:

2. Tags Selection on New Transactions: Currently, users can only add tags when editing an existing transaction. Would it be valuable to add tag selection capability when creating new income/expense transactions?

I'd be happy to implement these improvements in a follow-up PR if you think they'd be beneficial. Great work on the app by the way!