Update react-router to version 6

[apata]

Changes

Redo of #4384.

It's almost exactly the same as before, except link and navigation search parameters aren't parsed and stringified at the router level, the transforms are applied in custom components.

• deprecates withRouter HOC
• explicitly declares all app routes
• makes navigating to each route use the route definition
• replaces PlausibleSearchParams with a stringifySearch and parseSearch method, which are applied in the wrapped Link and navigate components AppNavigationLink and useAppNavigate and in QueryContextProvider
  • NB! components are operating with and changing the parsed object
  • NB! setting search param value to false used to be the way to remove the search param, but I wasn't able to keep this behavior, now setting the value to null is the way to do it
• refactors navigation links and buttons to new navigate API

Tests

• Automated tests have been added
• This PR does not require tests

Changelog

• Entry has been added to changelog
• This PR does not make a user-facing change

Documentation

• Docs have been updated
• This change does not need a documentation update

Dark mode

• The UI has been tested both in dark and light mode
• This PR does not change the UI

[github-actions]

Preview environment👷🏼‍♀️🏗️
PR-4408

[apata]

This time, it's tested to work with sites containing a forward slash: https://pr-4408.review.plausible.io/arturplausiblestaging.plausible.io%2Fdeep%2Fpath/?filters=((is,country,(RS)))&labels=(RS:Serbia)

Also works with share links (password is pr4408)
https://pr-4408.review.plausible.io/share/arturplausiblestaging.plausible.io%2Fdeep%2Fpath?auth=BU-38HHK6OeLSxWZn5Ix-

[ukutaht]

Getting this error on the preview deployment:

[apata]

Getting this error on the preview deployment:

Ah damn, browser difference in URLSearchParams implementation most likely. Getting the same with Safari. Checking

[apata]

Refactored to one of the methods listed in the url search params polyfill library that we use (https://github.com/jerrybendy/url-search-params-polyfill?tab=readme-ov-file#foreach). That should be safer, even though entries should have been compatible (https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/entries#browser_compatibility). Double checking with other browsers as well.