`documentElement` is never null in "normal" circumstances, but it can be `null`
if something explicitly removes the root element from the document, and this
situation has apparently occurred in the wild on some ChromeOS devices [1].

[1] https://hypothesis.sentry.io/issues/3987992034

Annotations received from the API always have a non-empty `target` array, as do
annotations and replies created locally that have not yet been saved. Unsaved
Page Notes were an exception. This led to an error [1] when hovering a new
unsaved page note in a VitalSource book, due to code not handling an empty
`target` array.  Resolve this by initializing the `target` field of new page
notes in the same way as replies and annotations (minus the `selector` property
that annotations have).

[1] https://hypothesis.sentry.io/issues/3745569320/

Fix an old crash [1] when attempting to create an annotation if groups have not
yet loaded. In this case there is no focused group for the new annotation to be
associated with.

The handling for now is to just ignore the request and delete the highlight in
the guest, similar to how we handle the case where the user is not logged in,
except we don't show the login panel.

[1] https://hypothesis.sentry.io/issues/4412536210/

Work around an exception when testing for shortcuts in `keydown` event handlers,
if the handler is called with an argument that is not a `KeyboardEvent`, and is
missing the expected `key` property. The workaround has been added to
`matchShortcut` because it is easier to do there than remember for each
`keydown` event handler, although there is a risk that other code in these
handlers could get caught out by the same issue.

I was able to reproduce this problem locally in Chrome 118 when using autofill
to insert text into the search input field (see comments), though there might be
other causes as well.

This should fix https://hypothesis.sentry.io/issues/3987386810/?project=69811

The `store.defaultContentFrame` selector had an incorrect return type, `Frame`
instead of `Frame|null`, because `frames[0]` has the static type `Frame`, even
though this can actually return undefined at runtime. As a result, TypeScript
didn't catch a missing null check when generating the default filename for the
export.

Fixes https://github.com/hypothesis/client/issues/5818

 - Add links at the top of the Import and Export tabs to a knowledge base
   article with information about using these features for various workflows.

 - Use a `<label>` for the "Select Hypothesis export file", since it is
   logically a label. This label is associated to the file input via `htmlFor`,
   but note the custom file input will still read the fixed button text ("Select
   a file")

 - Make labels bold in Import / Export tab to make them stand out against the
   help text, and also for consistency with the "Share" tab

Part of https://github.com/hypothesis/client/issues/5783

Allow the embedder frame to specify a list of feature flags that should be
overridden in addition to those enabled in the H user profile. This will be used
in the Hypothesis LMS app to enable feature flags to be turned on at the level
of an LMS app installation, rather than for individual users.

The ability to override flags has been limited to embedders (in practice, our
LMS app) to try and avoid a situation where arbitrary web pages enable, and
become dependent upon, feature flags that we later remove.

The flags coming from the embedder add to, rather than replacing, the profile
flags. This has been done to avoid a confusing situation where a feature flag
that is enabled for "everyone" in H actually ends up not being enabled for all
users due to eg. the LMS app disabling it for certain installations.

Part of https://github.com/hypothesis/client/issues/5803

 - Change `ConfigFromHost` type to only include settings that can come from
   either the host frame or embedder frame. Settings that can only come from
   a specific context have been moved into the `ConfigFromAnnotator` or
   `ConfigFromEmbedder` types respectively.

 - Add `features` config to `ConfigFromEmbedder`

 - Add `features` store method which combines feature flags from profile and
   global settings

 - Replace some references to `Config*` types in `build-settings-test.js`. The
   type references were wrong because RPC calls return the `ConfigFromEmbedder`
   type, not `ConfigFromHost`.

Bumps [@babel/preset-typescript](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-typescript) from 7.22.11 to 7.22.15.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.22.15/packages/babel-preset-typescript)

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Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.22.14 to 7.22.15.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.22.15/packages/babel-preset-env)

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Bumps [@babel/preset-react](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-react) from 7.22.5 to 7.22.15.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.22.15/packages/babel-preset-react)

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Bumps [prettier](https://github.com/prettier/prettier) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/3.0.2...3.0.3)

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Bumps [eslint](https://github.com/eslint/eslint) from 8.48.0 to 8.49.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v8.48.0...v8.49.0)

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Bumps [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) from 6.5.0 to 6.6.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v6.6.0/packages/eslint-plugin)

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Bumps [@sentry/cli](https://github.com/getsentry/sentry-cli) from 2.20.6 to 2.20.7.
- [Release notes](https://github.com/getsentry/sentry-cli/releases)
- [Changelog](https://github.com/getsentry/sentry-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-cli/compare/2.20.6...2.20.7)

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Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 7.66.0 to 7.68.0.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/7.66.0...7.68.0)

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Bumps [@hypothesis/frontend-shared](https://github.com/hypothesis/frontend-shared) from 6.5.0 to 6.7.0.
- [Release notes](https://github.com/hypothesis/frontend-shared/releases)
- [Changelog](https://github.com/hypothesis/frontend-shared/blob/main/docs/releases.md)
- [Commits](https://github.com/hypothesis/frontend-shared/compare/v6.5.0...v6.7.0)

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Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.22.11 to 7.22.17.
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- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.22.17/packages/babel-core)

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This completes the conversion of the sidebar's non-test files from JSDoc types
to native TypeScript syntax.

Implement a new progress display based on the mocks in
https://github.com/hypothesis/client/issues/5740#issuecomment-1699585881.

Fixes https://github.com/hypothesis/client/issues/5740

The implementation approach follows MUI's component of the same name.

Bumps [@typescript-eslint/parser](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/parser) from 6.4.1 to 6.5.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/parser/CHANGELOG.md)
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Bumps [rollup](https://github.com/rollup/rollup) from 3.28.0 to 3.28.1.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v3.28.0...v3.28.1)

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Bumps [postcss](https://github.com/postcss/postcss) from 8.4.28 to 8.4.29.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
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Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.1445.0 to 2.1450.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.1445.0...v2.1450.0)

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Bumps [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) from 6.4.1 to 6.5.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v6.5.0/packages/eslint-plugin)

---
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Bumps [@sentry/cli](https://github.com/getsentry/sentry-cli) from 2.20.5 to 2.20.6.
- [Release notes](https://github.com/getsentry/sentry-cli/releases)
- [Changelog](https://github.com/getsentry/sentry-cli/blob/2.20.6/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-cli/compare/2.20.5...2.20.6)

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Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 7.64.0 to 7.66.0.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/7.64.0...7.66.0)

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Bumps [@npmcli/arborist](https://github.com/npm/cli/tree/HEAD/workspaces/arborist) from 6.3.0 to 7.0.0.
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/latest/workspaces/arborist/CHANGELOG.md)
- [Commits](https://github.com/npm/cli/commits/v7.0.0/workspaces/arborist)

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Bumps [@babel/preset-typescript](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-typescript) from 7.22.5 to 7.22.11.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.22.11/packages/babel-preset-typescript)

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Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.22.10 to 7.22.14.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.22.14/packages/babel-preset-env)

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The `/* istanbul ignore next */` comment was not working as expected. Just
writing the test was the easiest solution.

This truncation is unicode-aware. There are other places in the app where do
truncation that are not. These could reuse the `truncate` utility to fix this in
future.

 - Add the document title to the suggested filename for exports, to make
   it unique across different documents by default.

 - Move `export-annotations.ts` to the `helpers/` directory, since it
   contains functions that are very much application-specific. The
   `util/` directory contains code which is potentially usable in other
   applications or libraries / is less domain specific.

 - Add a note about how filenames that are invalid on the user's system
   are handled

Part of https://github.com/hypothesis/client/issues/5709