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d3ed421038
Message view: Extract appendMessage() from rebuildMessages(). New messages are now incrementally appended (O(delta) widget ops) instead of destroying and recreating all bubbles (O(N)). Full rebuild only on initial load or message count decrease. WiFi TX: Buffer HDLC frame in PSRAM then send with single write() call. Previously sent per-byte (200+ syscalls per packet), now 1 syscall. Reduces CPU overhead and TCP fragmentation. Font: Disable unused LV_FONT_UNSCII_8 (compiled but never referenced).