Remove ticket 046 (implemented: chart legend squashing)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

tickets/046-chart-legend-squashing-for-many-series.md

@@ -1,38 +0,0 @@
-# 046 — Squash bars/legend entries when a chart has too many series
-
-## Summary
-
-`webapp/src/components/PanelChart.tsx` renders one bar (BarChart, lines
-103-119) or slice (PieChart, lines 122-145) per `PromqlSeries`, labeled via
-`seriesLabel()` (lines 18-23) and colored by cycling through a fixed
-8-color palette `COLORS` (line 26). There is no "top N + other" grouping,
-bar-squashing, or legend simplification anywhere in this file — with many
-series/labels, both charts render an unbounded number of bars/legend rows
-and repeat colors once the palette wraps.
-
-## Scope
-
-- Define a threshold above which a panel's series count is considered
-  "too many" (bars and legend entries alike).
-- Above the threshold, squash extra bars into an aggregated "other"
-  bucket (or equivalent visual simplification) rather than rendering one
-  bar per series.
-- Above the threshold, simplify the legend similarly (e.g. collapse to
-  top-N + "other", or a compact/paginated legend) instead of listing every
-  series.
-- Apply the same treatment consistently across all chart types in
-  `PanelChart.tsx` that can have many series (bar, pie), not just one.
-
-## Acceptance criteria
-
-- A panel with a large number of series (seeded fixture) renders a
-  bounded number of bars/legend entries instead of one per series, with
-  an "other"/aggregate representation for the rest.
-- A panel with few series is visually unchanged from current behavior.
-- Color assignment no longer visibly repeats for panels within the
-  squashed range (i.e. squashing keeps the rendered series count within
-  the palette size, or palette collisions are otherwise addressed).
-
-## Depends on
-
-None.