test(effects-manager): add tests for EffectsState enum and setHoverColor() (#886)

[deveshbervar]

Summary

Adds unit tests for the changes introduced in #889 as part of
Phase 1 (part 2 of 4) of the refactoring proposed in #886.

What this adds

25 tests covering:

EffectsState enum (6 tests)

• All 5 enum values exist with correct string values
• Enum has exactly 5 members

setHoverColor() (4 tests)

• Does not throw when called with no active hover outline
• Does not throw when called multiple times
• Independent from setSelectionColor()
• Updates active hover outline uniforms immediately

State transitions (11 tests)

• Initial state has no selections and no hover outline
• selectObject adds to selected set
• selectObject does not add same object twice
• deselectObject removes from selected set
• clearAllSelections empties the set
• setHoverOutline creates outline for unselected object
• setHoverOutline with null clears hover outline
• setHoverOutline does not create outline for selected object
• toggleSelection selects unselected object
• toggleSelection deselects selected object

Existing tests preserved (4 tests)

• All original EffectsManager tests still pass

Scope

• Tests added to existing effects-manager.test.ts
• 4 original tests preserved, 21 new tests added (25 total)
• Test file only — no production code changes
• 25 tests passing locally
• Part of refactor: EffectsManager missing state model, hover color not configurable, no experiment override API #886 — Phase 1, part 2 of 4

[sponce]

Thanks for this @deveshbervar. Looks all good to me. Merging :-)