v2.5.10

Fixed

• Online-timeout deadlock: audio silent when waitForOnline expires. When a Diretta target takes longer than ONLINE_WAIT_MS (2 s) to reach online state — e.g. a slow PLL relock on a first sample-rate switch, or an SDK regression stalling the connection handshake — DRUP entered a deadlock: sendAudio() returned 0 due to !is_online(), the ring stayed empty, getNewStream() kept sending silence, and the target never received real audio to complete the online transition. Fix: a new m_onlineTimeoutOccurred atomic flag is set when waitForOnline times out. sendAudio() bypasses the !is_online() guard while this flag is active, allowing the ring to fill. Once the ring reaches the prefill threshold, getNewStream() sends real audio to the target; if the target then goes online, playback proceeds normally. The flag is cleared at the next is_online() success and reset at the start of each open().