feat: add Quick Select (qselect) command with filter dialog

[mlightcad]

Summary

• Introduce a new qselect command that opens a Quick Select dialog.
• Add a reusable AcEdSelectionFilter and AcEditor.selectAll(filter) support in cad-simple-viewer.
• Implement end-to-end Quick Select flow (criteria building, preview counts, apply modes, and i18n strings) in cad-viewer.

Why

• Enable users to build selection sets by object properties (type, layer, color, linetype, lineweight) instead of manual picking.
• Provide AutoCAD-like quick filtering workflows with support for replacing, adding to, or removing from current selections.

What Changed

• Added command wiring:
• AcApQSelectCmd to open QuickSelectDlg.
• Registered qselect command and dialog in app bootstrap.
• Added filtering primitives:
• New AcEdSelectionFilter with DXF typed-value clauses and comparison operators (=, !=, >, >=, <, <=).
• New AcEditor.selectAll(filter) API to return filtered model-space IDs without mutating selection by default.
• Added Quick Select business logic in useQuickSelect.ts:
• Source scopes: entire drawing or current selection.
• Property/operator/value option generation.
• Matched/source count calculation.
• Apply modes: set, add, remove.
• Added MlQuickSelectDlg.vue:
• Form for scope/type/property/operator/value/mode.
• Live preview of matched count.
• Validation and success/warning feedback.
• Added exports and i18n entries (EN/ZH) for command and dialog text.

Risks / Notes

• Filtering and preview may iterate large model spaces, which could impact performance on very large drawings.
• Numeric comparison currently treats lineWeight as numeric input; invalid numeric input paths rely on existing conversion behavior.