Optimize settings and node selector hooks

[KingParmenides]

Summary

• Make useSettings and useNodes subscribe to the selected value instead of the whole Redux slice.
• Use shallowEqual so selectors returning small arrays/objects stay stable across unrelated store updates.
• Move pending approval subtype filters into memoized selectors so shared modal/alert hooks reuse stable arrays.
• Memoize pending background process and Bitcoin sync progress derivations, including conservative aggregate sync progress.

Refs #727.

Verification

• COREPACK_HOME=/private/tmp/codex-corepack-cache YARN_GLOBAL_FOLDER=/private/tmp/codex-yarn-global YARN_CACHE_FOLDER=/private/tmp/codex-yarn-cache npx corepack yarn eslint src/store/hooks.ts src/store/selectors.ts --quiet
• git diff --check

Note

• npx corepack yarn tsc --noEmit is blocked in this fresh checkout because generated src/models/tauriModel.ts is absent.

If this is accepted for the XMR bounty, I can provide the payout address.

[Einliterflasche]

Per our AI policy we require all communication to be exclusively human written. Until this requirement is met, we can't spare the effort to review this.