* fix: persona & skill dialog layouts + drag-and-drop on new cards
Restructure PersonaEditor and CreateSkillDialog to use fixed
header/footer with a scrollable middle area so action buttons
stay visible. Add useFileImportZone hook and wire drag-and-drop
file import onto the "New Persona" and "New Skill" cards.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* test: update SkillsView empty state text assertion
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>