feat: drag and drop file paths into terminal

[JustHereToHelp]

Summary

Fixes #746, fixes #2813

You can now drag a file from Finder (or Wave's own file browser) into a terminal block and it drops the quoted path. Been wanting this forever.

How it works:

• Native dragover/drop event listeners on the terminal's connect element
• Uses webUtils.getPathForFile() through a preload bridge since Electron 32 removed File.path
• Paths with spaces get properly quoted
• Added getPathForFile to the preload bridge (preload.ts) and typed it in custom.d.ts

Note: since this touches the preload bridge, it requires an app restart (not hot-reloadable).

Test plan

• Drag a file from Finder into a terminal — should insert the quoted path
• Drag a file with spaces in the name — should be properly quoted
• Drag from Wave's file browser into terminal — should also work
• Verify no interference with existing terminal mouse events

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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