WIP: ui-smoke phase 3: screenshots, writable config mirrors, homing settle#4136

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grandixximo:ui-tests-phase3

Commits on Jun 16, 2026

test: ui-smoke phase 3, screenshot the GUI on failure and confirm on pass
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test: run gmoccapy ui-smoke against a writable config mirror
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ui-smoke: settle after homing before requesting AUTO
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test: ui-smoke compare confirm shot to a committed reference image
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ci: install gdb up front so the ui-smoke crash dump path does not apt-get
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tests/runtests: export NOSUDO via RUNTESTS_NOSUDO so children can honor -u
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test: ui-smoke touchy-fit, fail if the window exceeds the screen
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test: bump ui-smoke compare fuzz to 40 % so the metric tracks real drift
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test: refresh touchy ui-smoke for the new minimum-height patch
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test: regenerate axis/gmoccapy/qtdragon references from CI output
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ci: move gdb to control build-deps so package-arch tests get it too
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ui-smoke: only use a readable core from this run for the native backtrace
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