Add Hebrew, follow the browser language, and gate the backend docs

Language

Hebrew (he-IL) joins English, German and Russian on the language site, in
the page metadata and in the list the backend reports.

A visitor who has not chosen a language now starts in the language of their
browser: the first preferred language that is published, compared by primary
language, with `iw` accepted as the former code for Hebrew. A browser that
prefers no published language gets en-US. A choice made in the menu is kept
under a new storage key and always wins. The earlier key was written on every
visit, so it could not tell a choice from the former English default; it is
no longer read, which resets an earlier explicit choice once.

Hebrew does not mirror the page. The layout, the navigation and code keep
their left-to-right arrangement; only text follows the language. The onward
arrow points left in Hebrew, and a left-to-right mark keeps "Visual X#"
intact inside right-to-left text.

The forum placeholder no longer has a language menu. It shows its one notice
in the language of the browser, with English as the fallback, and stores no
language. Its assets get a new cache key.

The single documentation column may now shrink below its widest code line.
Before, a long command widened the page on narrow screens, which cut
right-aligned text off.

The Hebrew text was not reviewed by a native speaker.

Documentation gate

The backend applies Dokka 2.2.0 with reportUndocumented and failOnWarning,
its public declarations have KDoc, and CI runs dokkaGenerate. The dependency
lock file and the verification metadata include the new artifacts.

Verified locally: frontend tests, type check, prettier and build; backend
test, bootJar and dokkaGenerate, which was also shown to fail on an
undocumented declaration; the Hebrew pages in a browser. The forum page was
exercised by its tests only.

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