Add interactive fitting example

[CSSFrancis]

Kind of a fun one. But I added in an example of fitting using mutiple components.

Screen.Recording.2026-04-05.at.10.12.52.PM.mov

@ericpre you might like this.

[CSSFrancis]

I just added an event where "f" fits the data using scipy.

[Copilot]

Pull request overview

Adds a new interactive 1‑D Gaussian fitting example and extends the widget/line interaction system to support richer interactions (widget visibility, new widget styles, and improved line hover/click behavior).

Changes:

• Add Widget.show()/hide() + visible state, and make JS rendering/hit-testing respect hidden widgets.
• Extend 1‑D widgets: RangeWidget(style='band'|'fwhm', y=...) and PointWidget(show_crosshair=...); add Line1D.set_data() for live overlay updates.
• Add a new interactive fitting example and a large set of tests covering line click routing and widget visibility/fitting flows.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_widgets.py	Adds new line-click tests and extensive new widget visibility + interactive fitting scenario tests.
pyproject.toml	Adds SciPy to optional dependencies (docs extra).
Examples/Interactive/plot_interactive_fitting.py	New end-to-end interactive Gaussian fitting example using widgets + SciPy fitting.
anyplotlib/widgets.py	Implements widget visibility API and extends RangeWidget/PointWidget initialization options.
anyplotlib/figure_plots.py	Adds Line1D.set_data() and extends widget-creation APIs with new parameters and optional batching.
anyplotlib/figure_esm.js	Implements visibility filtering, new widget rendering modes, improved line hover highlighting, and adjusted click/drag logic.

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[CSSFrancis]

I also added in the ability to add a ? help tool tip.

This is something I've always wanted in HyperSpy. So often I think the interactive features are hidden and a little help section would be so nice.