v0.3.3 - Nested Scan brand icon

Changes

• Replace the generic dashboard/checkmark icon with the new Nested Scan brand icon
• Visualize nested dashboard layers and a missing entity reference
• Preserve clear rendering at both 256 px and 48 px
• Include the editable SVG source under design/brand/icon.svg

Validation

• 43 tests passed
• Compileall passed
• Hassfest passed
• HACS validation passed
• GitHub Tests and Validate workflows passed