feat(shared-filesystem-storage): migrate ShareNetworkList to functional TypeScript (#2033)

[hodanoori]

Summary

Migrates ShareNetworkList in the shared filesystem storage plugin from a class component to a functional TypeScript component as part of the React 19 migration epic (#1774).

Changes Made

• Replace class component ShareNetworkList with a functional TypeScript component in list.tsx
• Replace componentDidMount and UNSAFE_componentWillReceiveProps with a single useEffect reacting to active and shareNetworks
• Convert loadDependencies, network, and subnet class methods to plain functions
• Add TypeScript interfaces for ShareNetwork, NetworksState, SubnetsForNetwork, and ShareNetworkListProps
• Delete list.jsx
• Add list.test.tsx with 14 unit tests covering dependency loading, loading state, table rendering, network/subnet resolution, and permission-gated Create New button

Related Issues

• Issue: closes [Task](share_networks): Migrate share_networks/list.jsx to React 19 #2033
• Epic: [EPIC](react-19): Upgrade to React 19 #1774

Screenshots (if applicable)

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings or errors.