[17/N] Add unit tests for AnimatedObject, AnimatedCircle, and AnimatedHighlightCircle

[karkir0003]

🥞 Stack

1. ⬅️ [1/N] Update CI to run frontend unit tests #91 (Update CI to run frontend unit tests)
2. ⬅️ [2/N] Configure React Testing Library and Setup Tests #92 (Configure React Testing Library and Setup Tests)
3. ⬅️ [3/N] Add unit tests for SideButton component #94 (Add unit tests for SideButton component)
4. ⬅️ [4/N] Add unit tests for SearchFilter component #95 (Add unit tests for SearchFilter component)
5. ⬅️ [5/N] Add unit tests for Header and Footer components #96 (Add unit tests for Header and Footer components)
6. ⬅️ [6/N] Add unit tests for Blob mascot component #97 (Add unit tests for Blob mascot component)
7. ⬅️ [7/N] Add unit tests for AboutScreen screen #98 (Add unit tests for AboutScreen screen)
8. ⬅️ [8/N] Add integration tests for HomeScreen screen #99 (Add integration tests for HomeScreen screen)
9. ⬅️ [9/N] Add unit tests for AlgorithmNotFound404 component #100 (Add unit tests for AlgorithmNotFound404 component)
10. ⬅️ [10/N] Add integration tests for AlgoScreen screen #101 (Add integration tests for AlgoScreen screen)
11. ⬅️ [11/N] Add unit tests for ModalSidebarSectionTab component #102 (Add unit tests for ModalSidebarSectionTab component)
12. ⬅️ [12/N] Add unit tests for BigOModal component #103 (Add unit tests for BigOModal component)
13. ⬅️ [13/N] Add unit tests for Pseudocode component #104 (Add unit tests for Pseudocode component)
14. ⬅️ [14/N] Add unit and integration tests for AlgoSection component #105 (Add unit and integration tests for AlgoSection component)
15. ⬅️ [15/N] Add unit and integration tests for root App component #106 (Add unit and integration tests for root App component)
16. ⬅️ [16/N] Add unit tests for animation events and undo functions #107 (Add unit tests for animation events and undo functions)
17. 👉 #CURRENT — Add unit tests for AnimatedObject, AnimatedCircle, and AnimatedHighlightCircle (this PR)
18. ➡️ [18/N] Add unit tests for AnimatedRectangle, AnimatedLabel, and AnimatedLine #109 (Add unit tests for AnimatedRectangle, AnimatedLabel, and AnimatedLine)

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Addresses #93

Context

Adds unit test coverage for the base animated entity abstraction and circular canvas primitives: AnimatedObject.js, AnimatedCircle.js, and AnimatedHighlightCircle.js.

Changes Made

• Introduced src/anim/__tests__/AnimatedObject.test.js covering AnimatedObject (properties, colors, text labels, highlight states, alignment math, cardinal point determination, and pointer attachment coordinates).
• Introduced src/anim/__tests__/AnimatedCircle.test.js covering AnimatedCircle (dimensions, head/tail vector attach positions, single-line and multi-line label drawing, character-level highlight rendering, and undo delete creation) as well as AnimatedHighlightCircle (ring stroke drawing and undo delete restoration).

Test Plan

• Ran npm test -- --watchAll=false
• Ran npm run lint and npx prettier --check src/
• Verified 100% statement, branch, function, and line coverage across AnimatedObject.js, AnimatedCircle.js, and AnimatedHighlightCircle.js