fix(standard-file): restore classic Open dialog

[benletchford]

Closes #449.

Cause

The retained Standard File get path synthesized a reduced three-item panel and enumerated only files. That discarded the classic volume, directory-navigation, scrollbar, and disabled-control state, and old-style SFGetFile calls ignored their requested dialog position.

Fix

• Restore the classic Open dialog structure: volume selector and label, folder/file list, scrollbar, disabled Eject, Desktop, Cancel, and context-sensitive Open controls.
• Retain directory state so folders can be opened and Desktop navigation refreshes the visible list.
• Honor the old-style dialog origin while preserving modern centering and the original reply/stack ABI.
• Remove synthetic empty-state copy and render disabled classic button labels with disabled ink.

Verification

• cargo test --lib — 2,952 passed, 3 ignored.
• Focused modern, old-style, navigation, cancellation, and disabled-control regression tests.
• Damage Incorporated Open-dialog flow exercised end to end; classic structure, placement, navigation controls, and disabled states visually confirmed.