Move geometry and text to single host-visible vertex/index buffers
created once and updated via vkMapMemory (no staging). Add
createDynamic*/updateDynamicBuffer helpers. Reduce vkWaitForFences
timeout from 5s to 100ms and skip/log on timeout to avoid blocking.
Update geometry only periodically (every 5 frames) and reduce logging
frequency. Destroy and null out old buffers before recreating them to
avoid double frees and leaks.
Cache lastRenderedText and only rebuild text vertex/index buffers when
the content or size changes; reuse buffers across frames and clean them
up on rebuild or shutdown.
Replace vkDeviceWaitIdle in copyBuffer with fence-based wait (longer
timeout) and remove noisy debug prints. Added members and cleanup for
text buffers and index count
Increase MAX_FRAMES_IN_FLIGHT to 3 and cap swapchain images accordingly
Replace vkDeviceWaitIdle with per-copy fence, extend wait timeout and
add diagnostic logging and counters Add stronger error logging and
cleanup on vertex/index buffer creation and copy failures; reset handles
to VK_NULL_HANDLE on failure
ubuntu1804