fix: preserve state when Enable All sites

[justlevine]

Description

This PR fixes the Enable All toggle on the Site Settings screen to preserve the state when toggling.

Technical Details

Checklist

Screenshots

To-do

Fixes/Covers issue

• Part of https://github.com/rtCamp/OneSearch-internal/issues/38#issuecomment-3522760345

[Copilot]

Pull Request Overview

This PR fixes the "Enable All" toggle functionality in the Site Settings screen to preserve the previously selected searchable sites when re-enabling sites, rather than resetting them to defaults.

Key Changes:

• Modified bulk toggle logic to restore previous searchable_sites selections when enabling sites
• Added filtering to ensure only sites with valid entities are preserved
• Updated ESLint ignore pattern for better coverage of build directories

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
assets/src/components/SiteSearchSettings.js	Implements state preservation logic in handleBulkToggle to restore previous searchable_sites when enabling, filtering out sites without entities
.eslintignore	Updates build directory ignore pattern from build/* to **/build/** for more comprehensive coverage

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