Forms: Add response view actions

[CGastrell]

Proposed changes:

This PR adds action buttons on inbox response view while also improving the response view behavior:

• response view actions act upon only the response, not the entire selection
• added read/unread toggle (it's handler is a noop until the new action from Forms: add read/unread state to the UI #45350 is merged)
• added mark as spam/not spam
• added trash/recover
• added navigation arrows to move through the list (this inevitably clears the list selection)
• added close button, also clearing the selection
• added sticky behavior to the response view, so scrolling the list doesn't get the response out of view

There's still room for improvement, as the selection vs checkbox is still not perfect UX.

Showcase:

Screen.Recording.2025-10-06.at.00.08.51.mov

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

p1HpG7-xga-p2
13siIQaeu2Q587EzImrUwk-fi-5020_26486

Does this pull request change what data or activity we track or use?

No

Testing instructions:

Load the dashboard inbox. Check the behaviors described on the description.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

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bin/jetpack-downloader test jetpack add/forms-response-view-actions

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[github-actions]

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Code Coverage Summary

Coverage changed in 2 files.

File	Coverage	Δ%	Δ Uncovered
projects/packages/forms/src/dashboard/inbox/response.js	0/110 (0.00%)	0.00%	27 💔
projects/packages/forms/src/dashboard/inbox/dataviews/index.js	0/150 (0.00%)	0.00%	24 💔

2 files are newly checked for coverage.

File	Coverage
projects/packages/forms/src/dashboard/icons/read.tsx	0/1 (0.00%) 💔
projects/packages/forms/src/dashboard/icons/unread.tsx	0/1 (0.00%) 💔

Full summary · PHP report · JS report

_{Coverage check overridden by Coverage tests to be added later Use to ignore the Code coverage requirement check when tests will be added in a follow-up PR .}

[ilonagl]

This is 🔥! 👏

[ilonagl]

Very minor note: could we make the spacing the same in the top as the bottom one?

[ilonagl]

I can't test the read/unread, I suppose due to other PR being open, but I suspect it works well. 🙌