test(ShareSheet-error-resilience): ShareSheet hydration stability, exception safety and error fallbacks

[Subhooo5]

Description

Fixes #2618

• Created components/dashboard/ShareSheet.error-resilience.test.tsx with a local ErrorBoundary class component that acts as the "localized boundary element" — catches render-phase exceptions, logs to console.error (dev telemetry), and renders a named recovery UI with a reset button
• mockUseShareActions is exposed at module scope so individual tests can override it to throw
• Test 1: isOpen=false produces zero DOM nodes — validates the null-render hydration path with no client/server mismatch risk
• Test 2: isOpen=true mounts cleanly with all key structural elements present — confirms stable baseline hydration
• Test 3: useShareActions throwing during render is caught by ErrorBoundary; fallback UI renders, console.error is called with the exception (telemetry assertion), and a Try again reset button is present on the recovery panel
• Test 4: window.open stubbed to throw simulates a browser policy block; component tree remains mounted and interactive after the event-handler error (React 18 does not unmount on event errors)
• Test 5: exportData with all-zero/empty values renders without throwing and shows no error fallback — confirms defensive prop handling

Pillar

• 🛠️ Other (Bug fix, refactoring, docs)

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (localhost:3000/api/streak?user=YOUR_USERNAME).
• I have run npm run format and npm run lint locally and resolved all errors.
• My commits follow the Conventional Commits format.
• I have starred the repo.
• I have made sure that i have only one commit to merge in this PR.

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[Subhooo5]

Hey @JhaSourav07 Test added successfully. All existing tests pass locally. Feel free to review, add necessary labels and merge it. 🫂🚀