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Perf wave1 opts (#4130)

* refactor(perf): Apply Wave 1 code-level performance optimizations

- shape: Hoist CURVE_MAP to module level
- class/dom/tooltip: Hoist regex constants to module level
- object: Replace Math spread with manual loop for large arrays
- state: Convert hiddenTargetIds/focusedTargetIds from Array to Set
- data: Update addTargetIds/removeTargetIds for Set API
- color: Reduce triple ids.indexOf() to single lookup
- point: Replace attr("class").indexOf() with classed()
- test: Update specs to use Set API (.has, .size)

* refactor(perf): Apply Wave 2 structural performance optimizations

- shape: Pre-compute prefix sums in getShapeX (avoid slice+reduce per bar)
- data: Replace mergeArray+filter in filterByX with flat double loop
- point: Extract inline .bind() calls to variables in updateCircle

* refactor(perf): Batch circle redraw and add focus-only threshold

- redrawCircle: for standard circle type, replace N-iteration .each()
  loop with two batch D3 filter passes — existing circles animate,
  new circles jump to position directly (preserves no-slide behavior)
- isPointFocusOnly: add opt-in point_focus_only_threshold config;
  auto-enables focus-only mode when total data points exceed threshold

* refactor(perf): Remove point_focus_only_threshold option

Reverts the auto-threshold feature added in the previous commit.
point_focus_only: true already covers the use case explicitly.

* refactor(perf): Counter-based transition IDs, shape offset pre-grouping, class memoization

- getRandom(): replace crypto.getRandomValues TypedArray allocation with
  a simple auto-increment counter; transition names need uniqueness, not
  cryptographic randomness (removes syscall + TypedArray alloc per call)
- getShapeOffset(): pre-build per-series same-stacking-group Map before
  the closure; eliminates .filter() array allocation on every datum
  (O(n*m) per redraw -> O(m) pre-build + O(1) lookup per datum)
- generateClass(): memoize result in state... (continued)

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