Headline is a Performance overlay under Settings → System with live CPU / memory / per-MCU readouts and sparklines — backed by MoonrakerPerformanceSource on hardware and MockPerformanceSource under --test. Also: refreshed Voron printer artwork, installer hook dispatch fixed on CC1 / M1 / AD5X / AD5M-ZMOD, embedded logs now persisted to flash, and another L081 sweep in bedmesh.
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Performance overlay (Settings → System → Performance) — live CPU load, memory usage, and per-MCU stats (load, awake, retransmits) with sparklines. MoonrakerPerformanceSource uses proc_stats + mcu subscription on real hardware; MockPerformanceSource reads /proc and synthesizes MCUs under --test. New helix_sparkline custom widget, reusable perf_metric_row XML component, pre-formatted CPU/mem/per-MCU text subjects, and dynamic per-MCU subjects.
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Voron printer artwork refresh (#964) — added V0, Legacy, and V2; retired V2.4-r2 and the 0-2 variants. Existing configs auto-migrate (v16 → v17).
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Active log destination shown in Settings → About — confirms at a glance where logs are landing on the current device.
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Performance overlay now populates on real hardware — MoonrakerPerformanceSource::start() ran at app init before the WS was connected and before the HTTP base URL was set, so the initial REST /machine/proc_stats and printer.objects.list RPC were both lost (REST: 'HTTP base URL not configured'; RPC: rejected by ready_to_send). notify_klippy_ready normally retriggers discovery but Moonraker doesn't emit it on cold-connect to an already-ready Klippy. Adds a multi-listener add_connected_observer / remove_connected_observer registry on MoonrakerClient that fires alongside the primary on_connected callback (WS open and Klippy ready, immediate-fire if already connected). The perf source hooks this observer to defer its initial handshake until the WS is up.
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Installer hook dispatch on CC1, M1, AD5X, and AD5M-ZMOD — missing case branches meant platform-specific post-install steps silently no-op'd on these targets.
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Embedded log routing prefers persistent flash — prevents log loss on devices where the previous default landed on tmpfs and disappeared across reboot.
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Theme border-radius applied to progress bars — they now match the rest of the UI instead of rendering with sharp corners.
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Retired Voron printer_image IDs auto-migrate (v16 → v17) — configs referencing the old IDs no longer show a broken-image placeholder after upgrade.
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L081 cleanup in bedmesh background callbacks — replaced bare tok.expired() checks with lifetime_.bg_cb to close another Mechanism C UAF surface.
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Bundled 16-bit PNGs downsampled to 8-bit — workaround for a lodepng SIGSEGV on certain platforms.
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Performance row moved from About to Settings → System — keeps About focused on identity / version and groups diagnostic readouts together.