feature(search): Include option descriptions in search when searchNormalize is true; fix add-new-option crash

[gnbm]

Feature: Option descriptions in search when searchNormalize is true

Before

With searchNormalize: true, only labels were normalized for search. Descriptions were matched with toLowerCase() only, so diacritics were not normalized.

Example: Searching brulee did not match an option with description Crème brûlée.

After

Descriptions are normalized the same way as labels when searchNormalize is true. Precomputed descriptionNormalized in setOptions() and getOptionObj(), and used in isOptionVisible().

Example: Searching brulee now matches Crème brûlée.

Changes

• Precompute descriptionNormalized and valueNormalized when options are prepared
• Use precomputed fields in isOptionVisible() for consistent diacritic-insensitive matching
• Update docs and types to state that searchNormalize applies to both label and description

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Bug fix: Crash when adding a new option in single-select

Before

Selecting the "add new option" item in single-select could throw:

TypeError: Cannot read properties of undefined (reading 'index')
at VirtualSelect.beforeSelectNewValue

The displayed value was sometimes wrong or missing.

After

If the temporary new option was removed before beforeSelectNewValue() runs (e.g. when dropdown closes and search is cleared), we re-add the option via setNewOption(selectedValue) and mark it selected. No crash, and the value displays correctly.

Changes

• Add null check for getNewOption() in beforeSelectNewValue()
• When temp option is missing but selectedValue exists, re-add the option and set it as selected

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Test cases

Test	Description
matches descriptions as-is when searchNormalize is false	Search brû matches option with description Crème brûlée
does not normalize descriptions when searchNormalize is false	Search brulee does not match when searchNormalize is false
normalizes descriptions when searchNormalize is true	Search brulee matches Crème brûlée when searchNormalize is true
add a new option (Allow to add new option)	Search Option not exist, select it, value text shows Option not exist without crash

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Validations

Ran regression scenarios in the documentation using the branch - ✅
Run automated tests - ✅