[Test Improver] Add unit tests for modal store mutations

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Goal and Rationale

shell/store/modal.ts manages the global modal dialog state used across the entire Rancher Dashboard UI. It had zero test coverage despite containing non-trivial logic:

• resources normalization: array → kept as-is, truthy non-array → [value], falsy → []
• Nullish-coalescing defaults for closeOnClickOutside and modalSticky
• Falsy-fallback defaults for componentProps and modalWidth

These are real decision branches — bugs here could cause modals to open with wrong resources, wrong width, or wrong stickiness.

Approach

• Directly import state, mutations from the store module (no Vuex store needed)
• Reset state via makeState() in beforeEach to keep tests isolated
• Table-driven it.each for the 5-case resources normalisation
• Individual it() for each default and explicit-value case
• closeModal tests verify full state reset

Coverage Impact

File	Stmts	Branch	Funcs	Lines
Before	0 %	0 %	0 %	0 %
After	100 %	100 %	30 %	100 %

Function coverage is 30 % because the seven trivial getter pass-throughs ((state) => state.X) are intentionally not tested (see Guidelines: "What NOT to Test").

Test Status

PASS shell/store/__tests__/modal.test.ts
Tests: 23 passed, 23 total
ESLint: 0 warnings, 0 errors

Reproducibility

# run tests
NODE_OPTIONS=--max_old_space_size=8192 node_modules/.bin/jest --no-coverage shell/store/__tests__/modal.test.ts

# lint
node_modules/.bin/eslint --max-warnings 0 shell/store/__tests__/modal.test.ts

Trade-offs

• Test file is self-contained and straightforward — low maintenance burden
• Getters are trivially simple (state => state.x) and not tested per project guidelines

Warning

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