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* fix(ElegooLink): pass printer SN to CC2 device panel URL The CC2 panel subscribes to MQTT topics keyed by the printer serial number. Without sn= in the URL it uses a wrong hardcoded fallback SN, subscribes to the wrong topics, and shows Offline permanently even though the printer is reachable. - Cache the SN in elegoo_cc2_test() (already fetches it, was discarding it) - Look up cache in get_print_host_webui(); fall back to a short LAN HTTP call on first use before the test has run - Append sn= to the panel URL - Clear the wrong hardcoded fallback SN/IP from the panel bundle - Add a small synchronous boot script to the panel that fetches the SN from the printer before the bundle reads URLSearchParams, as a fallback for unpatched binaries * fix(ElegooLink): persist CC2 serial number in AppConfig dev_sn section Store the printer SN under [dev_sn] keyed by normalized print_host after a successful connection test or system/info fetch. Reuse it on later sessions before hitting the network, matching how access_code is keyed by dev_id for other LAN printers. * fix(ElegooLink): answer get_sn IPC instantly from dev_sn cache The CC2 panel always calls get_sn with a 10s timeout. Remove the HTTP fallback from get_sn() and resolve IPC from dev_sn/memory only so Device tab load is not blocked after sn= is already in the URL. * fix(ElegooLink): skip get_sn IPC when URL already has sn The CC2 device panel calls get_sn with a 10s timeout on every MQTT connect even when Orca passes sn= in the query string. Use the URL serial immediately and only fall back to IPC when it is missing. * refactor(ElegooLink): resolve CC2 SN via PrintHost::get_sn in GUI Drop the ElegooLink.hpp include from PrinterWebViewHandler; the webview IPC handler uses the existing PrintHost virtual instead. Keep CC2 serial lookup helpers file-local in ElegooLink.cpp and share them between get_sn() and get_print_host_webui(). * chore: drop redundant <memory> include in PrinterWebViewHandler --------- Co-authored-by: SoftFever <softfeverever@gmail.com>