feat: route editor notifications to command line with recent message preview

[mlightcad]

PR Title

Route editor notifications to command line with recent message preview

PR Description

Summary

• Centralized editor notification output through command-line APIs instead of directly emitting layer command messages on the global event bus.
• Added typed message plumbing (AcEdMessageType) across AcEditor, AcEdInputManager, and AcEdCommandLine.
• Introduced a recent-message preview area above the command line that keeps the latest two messages visible and auto-hides after command completion.

Why

• Layer and input workflows needed a consistent, UI-owned path for user-facing feedback.
• Typed message severity handling (especially warnings) improves clarity for invalid inputs and command feedback.
• Recent-message preview improves visibility of prompt/status text without forcing the full history panel to stay open.

What Changed

• Replaced layer command notify() implementations to call AcApDocManager.instance.editor.showMessage(...) with AcEdMessageType.
• Moved AcEdMessageType into editor/input/ui/AcEdMessageType.ts, updated imports/exports, and reused it in eventBus typing.
• Added showMessage(...) forwarding methods in AcEditor and AcEdInputManager.
• Refactored command-line message rendering:
• Unified showMessage/error paths into typed appendMessage.
• Mapped warning messages to error-style line rendering for visibility.
• Recorded prompt/message text into a two-line recent panel.
• Added command lifecycle hooks to keep recent messages visible during commands and hide them 2s after command end.
• Updated keyword/entity rejection flows to emit warning messages via the new typed API.

Risks / Notes

• The new command lifecycle binding in AcEdCommandLine depends on AcApDocManager.instance.editor.events availability and uses deferred retry; startup timing should be verified in integration.
• Warning and error message types currently share the same history-line visual style; confirm this is intended UX.
• Recent-message panel visibility overlaps with existing popup layering; behavior in edge layouts/resizes should be validated manually.