fix: add aria-label to custom variable inputs for screen reader acces…

[sh1vam31]

Fixes #121

When a template with custom variables was used, the input fields in the
popup dialog had no aria-label attributes. This caused screen readers
like NVDA and VoiceOver to announce fields without names, e.g.:

• "edit text" (instead of "name, edit text")
• "stepper" (instead of "age, stepper")
• "pop up button" (instead of "color, pop up button")

Fix

Added aria-label attribute to all 6 custom variable input types:

• text.ts → <input type="text">
• number.ts → <input type="number">
• date.ts → <input type="date">
• time.ts → <input type="time">
• boolean.ts → <select>
• enum.ts → <select> (dropdown)

Testing

Tested manually using macOS VoiceOver (⌘ + F5):

Before fix: VoiceOver said "stepper", "pop up button" with no field names.

After fix: VoiceOver correctly announces field names:

• "name, edit text"
• "age, stepper"
• "color, Red, pop up button"
• "meeting_date, date picker"
• "has_vip, Yes, pop up button"