Extract DataViewPaginatedResponse

[kean]

This PR is a prerequisite for reimplementing "Jetpack Activity Logs" using "DataViews".

Summary

• Extracted DataViewPaginatedResponse for managing paginated data loading
• Implemented DataViewPaginatedForEach SwiftUI component for displaying paginated lists
• Refactored subscribers feature to use the new types
• Added test coverage for the pagination functionality
• Fix an issue with deleteItem not updating count (should decrement by one)
• Rename LoadMoreFooterView to make it clear it's part of the "DataView" infrastructure

Test Plan

• Verify subscribers list loads and paginates correctly
• Test error states and retry functionality in subscribers
• Confirm footer loading/error states display properly
• Run existing subscribers tests to ensure no regressions

https://github.com/user-attachments/assets/5af21bdb-893c-4790-a93d-26f1baece6c1

Note: nearly all code was generated with Claude Code (after many-many prompts)

[dangermattic]

	2 Warnings
:warning:	This PR is larger than 500 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.
:warning:	This PR is assigned to the milestone 26.0. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by :no_entry_sign: Danger

[wpmobilebot]

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

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	27883
	Version	PR #24592
	Bundle ID	com.jetpack.alpha
	Commit	f99f95c9151e7d5dd16b59bab48858cab4a8a6f6
	Installation URL	35vrmjvi9m3ng

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

[wpmobilebot]

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

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	27883
	Version	PR #24592
	Bundle ID	org.wordpress.alpha
	Commit	f99f95c9151e7d5dd16b59bab48858cab4a8a6f6
	Installation URL	7frij6e7ks93g

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

[kean]

Something is wrong with this PR. It keeps marking my replies as "Pending".

I addressed the feedback, and here was the reply about the filters UI/UX:

It might be the only reasonable option, and it matches the behavior on the web.

The primary use-case would be the following:

• You open "Subscribers"
• You want to see only your paid subscribers, so you select the filter
• We re-fetch the data
• It's less likely that you would scroll first and only then start filtering.

I'm open to suggestions how to improve this. I initially considered creating an in-memory store similar to the one for plugins, but I decided it wasn't needed as the current UI/UX with just an in-memory cache of the current request with a combination of fast response work really well. We should be able to use it for the majority of features.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud