[BUG] Map height fixed at 24rem

[wx4stg]

When embedding lonboard in panel (and probably other similar toolkits), the map height is fixed to 24rem, regardless of the parent container's height.

This issue is new since 0.9.3, I believe this issue was first introduced in 44a45f8. Continuing discussion from #264

Environment

• OS: Fedora 41
• Browser: Chrome/Brave
• Lonboard Version: 0.10.3

Steps to reproduce the bug

import panel as pn
from lonboard import Map
from lonboard.basemap import CartoBasemap

pn.extension()

title = pn.pane.Markdown('# THIS IS A TITLE')
lonb_map = Map([], basemap_style=CartoBasemap.Positron)
lonb_map_panel_container = pn.pane.IPyWidget(lonb_map, sizing_mode='stretch_both', align='center')

pn.Column(title, lonb_map_panel_container).servable()

[kylebarron]

I'm not great at HTML/CSS, so I'm not sure exactly what caused this regression. Open to any PRs. Also cc @vgeorge