Expense Submission Form

Build an expense submission form in Angular. The form collects the following fields:

• Date (required) -- when the expense occurred
• Amount (required) -- a positive number with two decimal places
• Category (required) -- a dropdown with options: Travel, Meals, Supplies, Software, Other
• Description (optional) -- a textarea, max 500 characters

Display inline validation messages when a field is invalid after the user has interacted with it. The submit button should be disabled until the form is valid. On submission, log the form value to the console.

Output

Produce TypeScript files in a src/app/ directory:

• src/app/expenses/expense.model.ts -- TypeScript type definitions
• src/app/expenses/expense-form.component.ts -- the form component

Do not include test files or build configuration.