fix(figure-editor): always render the default unzoomed view

[peymanvahidi]

What & why

When you zoom into the scatter plot and then open the figure editor, the editor showed the zoomed view — but its zoom-inset tool assumes the plot is sitting at its default, fit-all extent. So the inset's source rectangle mapped to the wrong data region and rendered points you never selected (#294). It only behaved if you hadn't zoomed beforehand.

The root cause is that the editor captures the plot through the same offscreen path as a PNG export, and that path replays the live d3 zoom/pan transform. The inset, meanwhile, derives its data region from the full data extent. Zoomed in, the two disagree.

The fix makes the figure editor always capture the default view — the same thing a double-click reset shows — no matter how the live plot happens to be zoomed at the time.

A sibling issue surfaced alongside it (#297): zooming into a region and then isolating left the old transform in place, so the isolated subset rendered under a stale view instead of filling the plot.

What changed

• Capture path → renderToCanvas (and captureAtResolution above it) take a resetView flag; when set, they render with an identity transform instead of the live one. The figure editor passes it at all three capture sites — the live preview, the export, and each geometric zoom-inset render — so the main plot and its insets agree on the default extent again.
• Isolation → isolateSelection() and resetIsolation() now reset the zoom after reprocessing, mirroring the existing "data changed → reset view" behavior. Entering an isolated subset, or leaving it, snaps back to the full view ([BUG] When zooming to a specifc region and isolating the view should reset to the full view #297).

How it stays safe

• resetView defaults to false, so the plain "export current view" path (export-utils) is untouched — it still captures exactly what's on screen.
• When the live plot isn't zoomed, the live transform is identity, so the new path is byte-for-byte the old behavior for the case that already worked — existing tests and the e2e figure-editor specs stay valid.
• New unit tests pin both directions of the flag at the renderer seam and its wiring through the compositor and modal, plus the isolate / reset-isolation zoom resets. The full core suite (1246 tests), type-check, and lint are green.

Fixes #294, #297