chore(js-ts): Replace AnyAction with RootAction for improved type safety

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Summary

Addresses the TODO in app/store/index.ts to improve type safety by replacing AnyAction with real Action types.

What changed:

• Defined a RootAction union type in app/reducers/index.ts that combines all currently typed Redux action modules (UserAction, NavigationAction, OnboardingActionTypes, SecurityAction, SdkAction, FiatOrdersAction, iAccountActions, iEventAction) with Action<string> as a fallback for untyped JS actions and RTK slice actions.
• Replaced AnyAction with RootAction in:
  • persistReducer call (app/store/index.ts)
  • ReduxStore type (app/core/redux/types.ts)
  • useThunkDispatch hook (app/components/hooks/useThunkDispatch.ts)
  • DeeplinkManager dispatch type (app/core/DeeplinkManager/DeeplinkManager.ts)

Why this matters:
AnyAction is { type: string; [extraProps: string]: any }, which allows accessing any property on an action object without type checking. RootAction prevents arbitrary property access without proper type narrowing, requiring consumers to narrow via switch (action.type) to get typed access to action-specific fields.

As more action modules are migrated from JS to TS (per the ongoing migration playbooks), they should be added to the RootAction union for progressively stronger type safety.

Review & Testing Checklist for Human

• Verify tsc --noEmit passes with no new type errors introduced by the RootAction type
• Spot-check that dispatching actions (e.g. thunks, RTK slice actions, plain JS actions) still compiles without errors across the app
• Confirm no runtime behavioral changes — this is a types-only change with zero impact on emitted JavaScript

Notes

• The combineReducers<RootState, any> in app/reducers/index.ts (line 182) is left as any intentionally — changing it would require all individual TS reducers to accept RootAction, which is a larger refactor tracked by a separate TODO.
• Also removed the related TODO comment in app/core/redux/types.ts for ReduxStore.
• Also cleaned up any-typed dispatch and removed // TODO comments in DeeplinkManager.ts.

Link to Devin session: https://app.devin.ai/sessions/9da3f26404ca4d04a2f7eed7899137eb
Requested by: @dr-phil

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