Replace deprecated input and form helpers

[bwstefano]

Summary

• replace react-autosuggest with an internal async combobox wrapper for geocoding and entity search
• replace the Discovery daterangepicker stack with a react-datepicker-based internal filter
• replace react-jsonschema-form with an internal @rjsf/core adapter while preserving merged formData behavior

Validation

• npm ci
• npm run test:unit
• npm run build
• php scripts/check-php-compat.php
• WP_CLI_PHP=/opt/homebrew/opt/php@8.4/bin/php WP_DIR=/tmp/jeo-plugin-wordpress-smoke bash scripts/wordpress-smoke.sh