v0.3.0

[0.3.0] – 2026-03-01

Added

• EditorShell with tool rail and inspector tabs.
• Command palette and recent documents hook.
• AppShell, ToolButton, EmptyState; UI primitives (Button, IconButton, Input, Panel, Toast, Tooltip).
• Block measurement form, block template modal, layers panel content.
• Layout undo context; piece label utils and tests.
• Sleeve block generator and tests; measurement profile types.
• Docs: migration checklist, UX/UI specs, PR plan, style guide; samples README and export changelog.

Changed

• App, views, dialogs, and panels updated for new shell and UX.
• Export, validation, visual engine, and piece rendering updates.