## What

Adds a search bar to the **Settings → Experience → Language** picker,
and makes languages searchable across languages.

Each option is matched against:
- its displayed label (the name in the current UI language)
- its name **in English** — typing `chinese` finds "Chinois — Simplifié"
- its **native name** — typing `中文` finds the same option

Matching is also accent-insensitive (`francais` finds "Français").

## How

- The shared `Select` already supports search via `withSearchInput`
(used by the currency/country pickers) — the picker just opts in.
- Cross-language matching uses the platform `Intl.DisplayNames` API to
derive each language's English and native names — no hardcoded
translation tables, no extra requests.
- A generic optional `searchKeywords` field on `SelectOption` lets the
`Select` filter match synonyms on top of the label; the filter now runs
through the existing `normalizeSearchText`, hence the
accent-insensitivity. Behavior is unchanged for every existing `Select`
(strict superset for ASCII labels).

## Test

- `nx typecheck` / `nx lint` pass for `twenty-front` and `twenty-ui`.
- Open the Language dropdown and try `chinese`, `中文`, or `francais`.


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