[hakarrr]

Problem

A Cartesian line or scatter chart throws during creation with fill: {target: 'shape', above: 'red', below: 'blue'}. Shape mode resolves its target to true, but the differing-color path tries to clip against that target's segments as if it were a line.

Change

Skip boundary-color clipping for the shape sentinel. Shape mode has no target boundary to compare against. It keeps the existing single-color behavior using below, including the fallback to the dataset background color, rather than adding a new two-color shape interpretation.

Actual line targets and scale boundaries still use the existing above/below clipping.

Verification

• 18 added cases: line and scatter with both index axes across all three filler draw timings, radar controls, and origin/start/end controls.
• Pristine source: the 12 Cartesian shape cases throw. With the guard: all cases render, including repeated updates; center pixels are the expected opaque blue.
• Fresh frozen-lockfile dependency install, full native Karma/ChromeHeadless suite: 1721/1721 pass.
• pnpm build, including declaration generation, and tsc --noEmit: pass.
• Changed-file ESLint: pass without warnings.
• Inspected actual before/after canvases: baseline throws and leaves a blank chart; fixed renders the enclosed square.

Firefox and downstream integration suites were not run.