docs: warn that a .talon file shadows a same-named .talon-list

[wesleyboar]

Overview

Warns that a .talon file silently shadows a .talon-list of the same basename in the same directory.

Related

• .talon-list silently skipped when a .talon file shares its basename talonvoice/talon#721
• fix: rename .talon files that shadow same-named .talon-list files talonhub/community#2312

Changes

• added a :::warning admonition to talon_lists.md

Testing

1. Open .talon-list Files.
2. Verify nothing mentions filename collisions.
3. Build this branch.
4. Verify a warning now appears above the user.key_special example.

Notes

• Talon keys loaded files by path-without-extension, so only one of the pair survives. The list registers with zero entries and its captures stop matching, with no warning or error.
• This problem is live in talonhub/community today: user.emoji and user.top_level_domain both load empty.

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