🌱 Create shared useLocalStorage hook and refactor consumers

[kubestellar-hive]

Fixes #14126

Creates a reusable useLocalStorage hook with cross-tab sync and refactors 4 hooks to use it, eliminating ~80 lines of duplicated localStorage boilerplate.

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[github-actions]

⚠️ Test Coverage Gaps

1 new file(s) have no matching test. This is informational — it will not block merge.

To add tests, see the test patterns in CLAUDE.md and existing examples
in web/src/hooks/__tests__/.

Hooks (1 untested)

New file	Suggested test location
web/src/hooks/useLocalStorage.ts	web/src/hooks/__tests__/useLocalStorage.test.ts

Hook test template

// web/src/hooks/__tests__/<HookName>-pure.test.ts
import { describe, it, expect, vi } from 'vitest'
// Mock external deps, then:
import { __testables } from '../<HookName>'
const { myPureHelper } = __testables

describe('myPureHelper', () => {
  it('happy path', () => { expect(myPureHelper('input')).toBe('expected') })
})

---

Checked against origin/main. Remove the needs-tests label once tests are added.

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Post-merge build verification passed ✅

Both Go and frontend builds compiled successfully against merge commit e3fcfb2fc26d373ae15c3c119805bbce5f9570f3.

[github-actions]

✅ Post-Merge Verification: passed

Commit: e3fcfb2fc26d373ae15c3c119805bbce5f9570f3
Specs run: smoke.spec.ts
Report: https://github.com/kubestellar/console/actions/runs/25966020905