feat: add maxFiles, multirow column labels

[kevinkim-ogp]

TL;DR

• Added support for configurable maximum file limits in attachment fields
• Allow MultiCol input fields to show Labels for the first row

What changed?

• Added maxFiles attachment field types
• Updated AttachmentSuggestions component to accept and use a maxFiles prop
• Modified file validation logic to use the configurable limit instead of the hardcoded MAX_NUM_FILES constant
• Updated error messages to display the actual file limit
• Allow Multicol to show labels on the first row
• Fixed MultiCol component alignment of inputs and delete button

How to test?

maxFiles

• Add maxFiles to the postman attachment field
• Verify that the limit is respected

MultiCol labels

• Add a Labelto a multirow-multicol field e.g., in Tiles or If-then
• Verify that the Labels are shown only for the first row
• Verify that the delete button is still aligned with the inputs

[kevinkim-ogp]

• refactor: create RTE with presets #1558
• chore: UI improvments for sending prompt #1556
• PLU-708 (chore): design improvements #1554
• feat: add maxFiles, multirow column labels #1553 👈 (View in Graphite)
• trunk/ai-actions

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