Filtering from visualizations doesn't show in filter toolbar or chat adjustment widget

[Dev-Lan]

When a user creates a filter by interacting with a visualization (e.g. brushing
or clicking a chart), the resulting selection is not reflected in either of the
UI surfaces that normally show active filters.

Two sub-issues:

• The filter does not appear as a chip in the filter toolbar
  (src/features/dashboard/components/FilterToolbar.tsx).
• The adjustment widget does not appear in the chat interface.

Expected: a filter created from a visualization should behave the same as one
created via other entry points — it should show up as a removable chip in the
filter toolbar and trigger the chat adjustment widget.