Add per-line colors and layer ordering to Graph View

[mxtmx]

Graph View handed out line colors by position and drew series in whatever order telemetry keys arrived in. Both are configurable now, from a new "Lines" section under "Telemetry to graph".

• Click a line's swatch for 32 Tailwind presets, a native color input, or a typed hex. Reset restores the automatic color.
• Drag a row or use its up/down buttons to reorder. The first line is drawn in front of the others and is listed first in the graph key.
• Both work while the graph is running, via the palette icon in the header.
• The Lines list shows only selected keys the current op mode is sending.

Notes

• MultipleCheckbox had to become controlled. Left uncontrolled, its internal selected state overwrites the layer order every time another key gets checked.
• Graph takes two new options, seriesOrder and seriesColors. Before this change renderGraphLines indexed into the palette while renderKey read a color stored on the series, so the key and the plot could disagree about a line. Both go through one lookup now.
• GraphCanvas repaints once while paused, so edits show without resuming. Colors and order are component state and reset on reload.
• Space on a focused Graph header button presses the button rather than pausing.

graph-colors-layering.mp4