Sidebar: Reader Lists and Organization

[kean]

This PR adds "Lists" and "Organization" sections to the Reader sidebar, which were the only remaining items.

Note: the icons for the "organization" lists are no there yet. I'll update both the app sidebar and the Reader sidebar with the icons from the WordPress Design Library separately.

For both "Lists" and "Organization" you can't yet see what's in there. This will need to be implemented separately.

To test:

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

3. What automated tests I added (or what prevented me from doing so)

PR submission checklist:

• [ ] I have completed the Regression Notes.
• [ ] I have considered adding unit tests for my changes.
• [ ] I have considered adding accessibility improvements for my changes.
• [ ] I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• [ ] WordPress.com sites and self-hosted Jetpack sites.
• [ ] Portrait and landscape orientations.
• [ ] Light and dark modes.
• [ ] Fonts: Larger, smaller and bold text.
• [ ] High contrast.
• [ ] VoiceOver.
• [ ] Languages with large words or with letters/accents not frequently used in English.
• [ ] Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• [ ] iPhone and iPad.
• [ ] Multi-tasking: Split view and Slide over. (iPad)

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr23574-4b8eed1
	Version	25.3
	Bundle ID	org.wordpress.alpha
	Commit	4b8eed1ce4bf7fd14669b8b9e6a668a20eb51c8b
	App Center Build	WPiOS - One-Offs #10647

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr23574-4b8eed1
	Version	25.3
	Bundle ID	com.jetpack.alpha
	Commit	4b8eed1ce4bf7fd14669b8b9e6a668a20eb51c8b
	App Center Build	jetpack-installable-builds #9691

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[kean]

I had to rebase it - done.