fix: board icon emoji shows as unicode text on create modal

[rusackas]

Problem

When opening the Create Agent modal in Settings, the board icon field displays the default emoji (📋) as raw unicode text (e.g. 📋) instead of rendering the actual emoji character. Once you pick an emoji from the picker, it displays correctly.

Root Cause

Form.Item name="icon" was missing initialValue="📋". Without it, Ant Design's form has no stored value for the field until the user interacts with it. FormEmojiPickerInput reads the form value via form.getFieldValue(fieldName), which returns undefined initially — falling through to the defaultEmoji prop. But the inner <Input> renders with the form's FieldContext, and without an initialValue the field value shown can differ from the prefix display.

Fix

Added initialValue="📋" to both the create and edit modal's Form.Item name="icon", matching the existing pattern in UsersTable.tsx (which correctly has initialValue="👤").

// Before
<Form.Item name="icon" noStyle>

// After  
<Form.Item name="icon" initialValue="📋" noStyle>

The edit modal already calls form.setFieldsValue({ icon: board.icon }) before opening, so initialValue there is redundant but harmless.

🤖 Generated with Claude Code

[mistercrunch]

needs rebase but approved!