NM.AccessPoint.get_max_bitrate() reports a value that doesn't account
for MIMO spatial streams or extended channel widths, leading to the
negotiated speed appearing higher than the supposed max (e.g. 1729 vs 540).
Remove the max from the connected info Speed line where the comparison
is misleading. Keep it in the AP list where it serves as a relative
indicator between access points.
The linear scale against WiFi 7 theoretical max (5760 Mbit/s) made real-world speeds look insignificantly low. A logarithmic scale gives meaningful visual feedback for typical connections (e.g. 300 Mbit/s fills ~66% instead of ~5%).
Bump version to 6.
