[BUG] graph rendering broken when flip-x false

Checklist before submitting an issue

• I have searched through the existing closed and open issues for eww and made sure this is not a duplicate
• I have specifically verified that this bug is not a common user error
• I am providing as much relevant information as I am able to in this bug report (Minimal config to reproduce the issue for example, if applicable)

Description of the bug

the graph widget fill rendering is broken when :flip-x false.

EWW renders like the image on the left where should look like on the right (fixed using image manipulation software)

Reproducing the issue

eww.yuck

(box
  :class "my_container"
  (graph
    :class "my_graph"
    :value {EWW_CPU.avg}
    :time-range "60s"
    :min 0
    :max 10
    :flip-x false
  )
)

style.scss

.my_container {
  background: #555;
  min-width:160px;
  min-height:100px;
}

.my_graph {
  color: #ea841e;
  background: #ea841e;
}

Expected behaviour

the fill algorithm should pick the correct bottom corners.

Additional context

No response

Platform and environment

hyprland.

just built the 865cf631d5bbb5f9fccc99b3f4cc80b9eeada18c commit of EWW.