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Temp Graph Fix (Optional / Nice to Have)

Fixes the temp graph view so the progress ring/arc no longer covers the labels.

When You Need This

You switch to the temp graph view and still see the colorful ring or black arc on top of the temperature labels.
You want the temp graph view to show only the chart + labels, with the progress visuals hidden.

What It Changes

Adds a real ui_progress_enable() implementation so progress updates can be disabled while the temp graph is visible.
Uses ui_get_progress_enabled() inside update_print_progress() to skip ring/arc updates when progress is disabled.
Raises the temp graph labels to the top of the LVGL object stack so text is never obscured.

Files Touched

src/lvgl_usr.cpp (progress enable flag + z-index adjustments for the temp view)
src/ui_overlay/lv_print_progress_update.cpp (reads ui_get_progress_enabled() before drawing)

Expected Result

Temp graph view: black background, only the chart and two labels visible, no ring/arc artifacts.
Progress view: unchanged behavior when ui_progress_enable(true) is active.

Quick Verification

Switch to the temp graph view: ring/arc stays hidden and labels stay on top.
Serial monitor shows [Progress] Updates DISABLED when entering the temp graph view.