PrintSphere v1.5-rc2_debug

Debug build following v1.5-rc1_debug001. Focuses on external spool support, filament change UX, and progress display reliability.

External Spool (EXT) Support

• Added EXT spool pill on the AMS page showing material type, color, and "EXT" label.
• EXT pill is now visible as soon as the printer targets the external spool (tray_tar == 254), not just when actively using it.
• Fixed vt_tray JSON parsing: Bambu printers place vt_tray as a sibling of ams under print, not inside. Both locations are now checked with fallback
• Shrunk AMS pills slightly and adjusted layout to prevent overlap when the EXT pill is shown alongside AMS units.
• Material label font reduced to 14px so 4-character types like "PETG" fit on one line without wrapping.

Filament Change Fixes

• Suppressed false "failed" status during filament change stages. Error code 134201350 (0x07FFC006) is a Bambu user-action prompt, not a real error.
• Corrected "unloading" → "loading" label when the printer asks the user to load external filament.
• Lifecycle label now shows the correct loading/unloading detail before the error check, preventing error states from masking filament change progress.

Download Progress

• Fixed download progress getting stuck at 99%. The sticky progress_is_download_related flag now clears reliably when leaving the download phase

Web Portal

• Fixed settings panel summary alignment: badge icons now align to the top instead of center, preventing visual drift on panels with multi-line descriptions.
• Status bar now clears automatically once setup is fully complete (cloud connected or local configured without errors), instead of showing a stale "Connect Bambu Cloud" prompt.

Internal

• Diagnostic logging for vt_tray fields added to printer client ([DIAG] vt_tray: log line).