Replace text unescapes escape sequences

[JoltedJon]

Currently in the find and replace for the editor if you were to try to do something like '\t in the replace section it will keep it escaped. This PR makes it so that it will instead replace it with the unescaped version of an actual tab character. Useful for cases where you copy from one editor that uses spaces and you want to replace those spaces with tab characters.

Summary by CodeRabbit

• Bug Fixes
  • Replacement text in the find-and-replace tool now correctly interprets C-style escape sequences before applying replacements.

[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: ee536659-4efb-4a06-a40f-83f376fd7e4d

📥 Commits

Reviewing files that changed from the base of the PR and between d890d7d and 7a311a3.

📒 Files selected for processing (1)

• editor/gui/code_editor.cpp

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Walkthrough

FindReplaceBar::get_replace_text() now returns the replacement field contents after C-style unescaping.

Changes

Replacement Text Handling

Layer / File(s)	Summary
Unescape replacement input editor/gui/code_editor.cpp	FindReplaceBar::get_replace_text() applies c_unescape() before returning replacement text.

Estimated code review effort: 1 (Trivial) | ~2 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 change: replacement text now unescapes escape sequences.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests

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[Shakai-Dev]

LGTM