Room names with non-ASCII characters (e.g. ò) were double URL-encoded
when appended as query parameters to websocket, conference-request, and
keepalive URLs. getBackendSafeRoomName() returns a percent-encoded string
which was then re-encoded by URLSearchParams.append() via appendURLParam().
Extract getNormalizedRoomName() that decodes, NFKC-normalizes, and
lowercases without percent-encoding, and use it in the appendURLParam
call sites. getBackendSafeRoomName() is refactored to call it internally,
preserving identical behavior for all other callers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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