fix: config dialog made main window unresponsive (BUG-002)

[JoshCLWren]

Summary

• wm_transient was called on the master window instead of the dialog, making the main window subordinate to the config dialog — it hid behind it and became unclickable/unresponsive
• The Close button called dialog.destroy() directly, bypassing on_close(), so _dialog_active was never reset to False
• Replaced catch-all <Key> binding (closed dialog on any keypress, including typing in the color entry) with explicit <Escape>, q, Q bindings
• Removed spurious <Double-Button-1> close binding

Test plan

• make pytest passes with 96%+ coverage
• 5 new regression tests in tests/test_bug_002_config_dialog.py all green
• Manually: open config via right-click → Configuration, verify main window stays visible and interactive behind the dialog
• Manually: Esc, q, Q all dismiss the config dialog
• Manually: typing in the background color entry does not close the dialog

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 89fcf41e-3ef5-4c24-a5df-2c192e9e5c46

📥 Commits

Reviewing files that changed from the base of the PR and between dc9fc4d and 7c39459.

📒 Files selected for processing (3)

• Makefile
• cdisplayagain.py
• tests/test_bug_002_config_dialog.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/bug-002-config-dialog-unresponsive

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