🔍 💥 Add UX for client-side search

[agoose77]

This PR is a rough stab at a frontend component for client-side search. There are already some sharp edges to rework:

• [x] Remove reference to @myst-theme/search in @myst-theme/common once mystmd exports myst-spec-ext with the latest tyeps
• [x] Handle pagination or scrolling
• [x] Improve highlight renderer to e.g. reduce ellipsis :rofl:
• [x] Add "context" e.g. current doc/section and highlight for each entry
• [ ] Think about whether this can/should be generalised for a server-side search

https://github.com/user-attachments/assets/02188866-daf8-4efc-93c7-d1737ff11ed2

[!NOTE] To test this PR:

1. Build https://github.com/jupyter-book/mystmd/pull/1530 and run myst start --headless
2. Run theme:book as usual

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 4fd5216b0751d296bb1163c93673be6f6da1dffa

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 12 packages

| Name | Type | | ----------------------- | ----- | | @myst-theme/site | Patch | | @myst-theme/book | Patch | | @myst-theme/providers | Patch | | @myst-theme/frontmatter | Patch | | @myst-theme/diagrams | Patch | | @myst-theme/jupyter | Patch | | @myst-theme/styles | Patch | | @myst-theme/common | Patch | | @myst-theme/icons | Patch | | @myst-theme/article | Patch | | myst-to-react | Patch | | myst-demo | Patch |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[agoose77]

@stevejpurves @rowanc1 input always welcome, but I'll keep chipping away at this.

[agoose77]

Phew, made some good progress! My goal here is to build out "an approach", and then we can iterate on the design.