feat: add support for updateBotbar (see line 203 in Chart.svelte)

[vattevaii]

Well, I was building something with the library.. and ended up needing the drawBotBar method in my navy script..

Found it was not implemented.. Got ahead and read the code.. (well installed prettier for readability, inconsistent spacing all over the files)

Implemented it..

What i did:

• added a grids array on Chart.svelte, binded it to the grid instance in Pane.svelte
• pass the grids array into BotBar, extract all layers $: layers = grids.map((grid) => grid.getLayers() || []).flat()
• call drawBotBar if present in each layer

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[vattevaii]

if you need me to remove prettier, please do tell
or I could separate my commits into

• prettier format whole project
• then do the required changes