Provide icon for monotonic cubic interpolation

[VictorSohier]

Fixes #1333

Summary by CodeRabbit

• UI Improvements
  • Added visual indicators for the additional monotonic and monotonic-angle interpolation modes in the animation track editor.
  • Updated interpolation icon mapping to display the correct icon for the expanded set of interpolation options.

[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 Plus

Run ID: f45a791e-8040-49ab-9023-d323d7cdcd2f

📥 Commits

Reviewing files that changed from the base of the PR and between a9bf86c and 1967b41.

📒 Files selected for processing (1)

• editor/animation/animation_track_editor.cpp

🚧 Files skipped from review as they are similar to previous changes (1)

• editor/animation/animation_track_editor.cpp

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Walkthrough

The animation track editor expands its interpolation icon mapping from five entries to seven, adding icons for monotonic cubic and monotonic angle interpolation modes.

Changes

Animation interpolation icons

Layer / File(s)	Summary
Expand interpolation icon mapping editor/animation/animation_track_editor.cpp	The interp_icon array now includes InterpMonotonic and InterpMonotonicAngle alongside the existing interpolation icons.

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: adding the monotonic cubic interpolation icon.
Linked Issues check	✅ Passed	The change adds icon support for monotonic interpolation modes and fixes the crash cause implied by the issue.
Out of Scope Changes check	✅ Passed	The patch is narrowly scoped to the animation track editor and directly supports the linked issue.
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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