Update pre and post ignition date sliders / cloud %

Add more flexibility to date sliders. They are currently limited to 12 months before and after ignition

Perhaps look into a double slider to select a date range for pre and date range for post

Slider for cloud %

Start by locating the date-slider components and the logic enforcing the current 12-month pre- and post-ignition limits. Trace how those controls affect map filtering, then confirm the desired interaction for separate pre/post date ranges and cloud percentage; done means all three filters can be selected and applied as expected.

Written by the indexing model from the issue text.