GH-1307 Fix texture not appearing until restart

[JoltedJon]

fixes #1307

The guard for this only checked for AtlasTexture but if other types of textures were inputted in it would not connect the function to cause it to be updated.

Summary by CodeRabbit

• Bug Fixes
  • Improved atlas texture updates when switching between different atlas resources.
  • Ensured change notifications are correctly disconnected from the previous atlas and connected to the newly assigned one.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a883a0f4-3260-472b-8eed-091b9b5bac01

📥 Commits

Reviewing files that changed from the base of the PR and between 44ce9f4 and 4fd3234.

📒 Files selected for processing (1)

• scene/resources/atlas_texture.cpp

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Walkthrough

AtlasTexture::set_atlas now disconnects the change callback from any previously valid atlas resource and connects it to any newly assigned valid atlas resource.

Changes

Atlas signal wiring

Layer / File(s)	Summary
Atlas resource signal handling scene/resources/atlas_texture.cpp	set_atlas broadens signal disconnection to valid resources and uses the assigned atlas validity check when connecting the callback.

Estimated code review effort: 2 (Simple) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main fix: AtlasTexture textures not appearing until restart.
Linked Issues check	✅ Passed	The code change matches issue #1307 by fixing signal wiring so atlas texture updates propagate immediately.
Out of Scope Changes check	✅ Passed	The PR is narrowly scoped to atlas texture signal handling and adds no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Shakai-Dev]

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