Bars in the BA sub-objects pane are now visually grouped by the
P\d+L\d+ fragment extracted from their opaque IDs (e.g. P1L1, P2L3).
Each group renders as a row of compact inline-block chips; groups are
separated by a line break. Fallback: if an ID contains no P?L?
pattern, trailing digits are stripped instead, yielding singleton rows.
The grouping is a display-only heuristic — no semantic meaning is
derived from the ID. Chips are clickable, highlight when focused.
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