Roland Parnaso c4e626b1fa refactor: extract _detect_file_drop() + add 28 tests ...

Extract the inline file-drop detection logic into a standalone
_detect_file_drop() function at module level for testability. The main
loop now calls this function instead of inlining the logic.

Tests cover:
- Slash commands still route correctly (/help, /quit, /xyz)
- Image paths auto-detected (.png, .jpg, .gif, etc.)
- Non-image files detected (.py, .txt, Makefile, etc.)
- Backslash-escaped spaces from macOS drag-and-drop
- Trailing user text preserved as remainder
- Edge cases: directories, symlinks, no-extension files
- Non-string input, empty strings, nonexistent paths

2026-04-02 00:40:27 -07:00

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