feat(PrizePool): redesign table via Table2 with collapse rework

[Eetwalt]

Summary

• Migrate prize pool table rendering from the legacy Widget/Table to Widget/Table2 (header/body/footer sections, declarative rowspan/colspan)
• Reorder columns: Participant moves directly after Place; points column now renders before qualifies; currency/points cells right-aligned
• Rework collapse: class-based general-collapsible toggle rendered in the footer, replacing the per-row applyToggleExpand machinery; child classes now only supply open/close label text
• Rewrite per-column prize-cell merging via a prize matrix + Array.groupAdjacentBy/Table.deepEquals, extracted into _opponentPrizeCells
• Display placements as plain numbers/ranges (e.g. 1, 1-2) instead of ordinals, with colored gold/silver/bronze badges and pale row tints for top-3
• Restyle stylesheet for the Table2 structure; skip the legacy JS toggle when the table is inside .prizepool-table-wrapper
• Emit rowspan/colspan from Table2 Cell/CellHeader even without column definitions

How did you test this change?

dev + devtools

Before	After

[Eetwalt]

since we are at it this should also take room for currency switch into account

This can be in a separate PR imo

[hjpalpha]

since we are at it this should also take room for currency switch into account

This can be in a separate PR imo

there already is #7687
but it will obviously get a shit ton of merge conflicts with this PR :P

[ElectricalBoy]

there already is #7687 but it will obviously get a shit ton of merge conflicts with this PR :P

there's no way that there won't be a merge conflict
that thing is grid-based :p

[Eetwalt]

• what implications does this pose to the overall memory/runtime? (was one of my concerns when I was writing feat(prizepool): Redesign and currency switch for prize pools #7687)

Looking at https://liquipedia.net/dota2/index.php?title=BLAST/SLAM/7 with old and new prizepool, there seems to be not much difference

New	Old