Fix/ci filtering and tests

[Abidoyesimze]

Description

What this PR does
This PR stabilizes CI after the filtering optimization work by fixing lint, TypeScript, and Jest regressions that were blocking the pipeline.

Changes included

Filtering performance hook
Updated src/hooks/useSubscriptionFilters.ts (already optimized) and kept it lint/type-safe.
Add Subscription typing fix
In src/screens/AddSubscriptionScreen.tsx, introduced a local form type extending SubscriptionFormData with priceError.
Fixed form handler key typing to support local validation fields without breaking domain types.

Wallet service unit tests fix

In src/services/tests/walletService.test.ts:
Removed problematic require(...) usage and cleaned imports.
Fixed TS private-field type collision (never intersection issue under TS 5.8).
Reworked provider mocking to use jest.spyOn(ethers.providers, 'JsonRpcProvider') for reliable behavior.

Applied Prettier/ESLint-compatible formatting.

Snapshot + lock alignment

Included updated contract test snapshots and lockfile changes required by local CI run.
Why this is needed
CI was failing with:
Prettier/ESLint errors
TypeScript errors (form type + test helper typing)
Jest failures in walletService.test.ts due to provider mock shape mismatch
This PR resolves all blocking errors and restores a passing pipeline.

Validation

Ran full local CI successfully:
npm run lint ✅ (warnings only, no errors)
npm run contracts:codegen:check ✅
npx tsc --noEmit ✅
npm run test ✅ (all suites pass)
npm run contracts:test ✅
npm run contracts:fmt ✅
npm run contracts:clippy ✅

closes #30

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