Key enum missing punctuation/symbol keys (Slash, Minus, Equals, etc.)

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Problem

The Key enum in three-d only includes alphanumeric keys (A-Z, 0-9), arrow keys, and a handful of special keys (Escape, Tab, Enter, etc.). It's missing all punctuation and symbol keys such as:

• Slash (/)
• Minus (-)
• Equals (=)
• Backslash (\)
• Semicolon (;)
• Period (.)
• Comma (,)
• Bracket keys, etc.

This means Event::KeyPress is never emitted for these keys, because translate_virtual_key_code() returns None for any VirtualKeyCode that doesn't map to a Key variant.

Additionally, ReceivedCharacter events are suppressed when modifiers.command or modifiers.ctrl is true (in frame_input_generator.rs line ~291), so there is no way at all to detect modifier+symbol key combinations like Cmd+/, Cmd+-, Ctrl+=, etc.

Impact

This makes it impossible to implement common keyboard shortcuts that use punctuation keys:

• Cmd+/ — toggle line comment (standard in virtually every code editor)
• Cmd+- / Cmd+= — zoom out/in
• Cmd+\ — split pane

These are especially important for applications using the egui-gui feature for text editing, since egui's own Key enum includes these keys but three-d never forwards them.

Suggested Fix

1. Add the missing variants to the Key enum (at minimum: Slash, Minus, Equals, Backslash, Semicolon, Period, Comma, BracketLeft, BracketRight)
2. Add the corresponding mappings in translate_virtual_key_code()
3. (Optional) Also add mappings in the From<&Key> for egui::Key impl so they pass through to egui correctly

This would be a non-breaking addition since it only adds new enum variants.

Workaround

Currently the only workaround is to use a cargo [patch] with a local copy of three-d, or to remap shortcuts to letter keys (e.g. Cmd+Shift+C instead of Cmd+/).

Environment

• three-d 0.18.2
• macOS (also affects Linux/Windows)
• Using egui-gui feature for a code editor UI