feat: show firmware update progress on e-ink display - #33
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Custom NervesHubLink.Client hooks into fwup progress callbacks and renders a progress bar across the top of the screen. Shows a full-screen 'Rebooting...' message before the device restarts. Throttled to re-render every 5% to avoid overwhelming e-ink.
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Summary
FirmwareProgressAgent for state + Registry pub/sub to trigger screen re-rendersCloses #24
Test plan
NameBadge.FirmwareProgress.set_state({:downloading, 50})shows progress bar on host previewfor p <- 0..100//5, do: (NameBadge.FirmwareProgress.set_state({:downloading, p}); Process.sleep(1500)):rebootingstate shows clean full-screen message:idleclears progress bar