Previously, any value type could be passed for any style key without
compile-time error, allowing bugs like passing a string for a boolean
property. Using a generic constraint ensures the value type matches the
key's declared type in CellStateStyle, catching mismatches at compile
time.

Tasks

• improve description. Not really a breaking change as wrong values leads to bug

This is a breaking change for any consumer calling setCellStyles with a value that does not match the type of the specified key. These calls were already semantically incorrect — the stricter type now surfaces the error at compile time.

Notes

Covers #840
Should be merged after #1026