refactor(event-form): move the CFP reopen section into the Materials panel

[caseylocker]

ref: https://app.clickup.com/t/86bbhwf58

What

The CFP reopen control sat at the top of the activity form, just above Submitter. Visible, but not grouped with the thing it governs. It now lives inside the Materials panel, below the materials table.

The one thing that changes shape

The panels are a single open accordion: showSection initialises to "main" and toggleSection collapses whatever was open. So Materials is closed on page load, and moving the control there costs the ability to see at a glance whether a talk has a live window.

The panel title carries that state instead, so nothing operational is lost:

State	Collapsed header reads
No active window	Materials
Active window	Materials — submission reopened until August 22, 2026 6:51 am

Why the title shares the section's gate

isReopenSectionVisible() is new, and both the title and the section body use it.

Keying the title on isSubmissionReopened() alone would announce a deadline in exactly the case the existing comment on isReopenApplicable() warns about: a grant is issued, then the plan's submission_end_date is extended past it, so the speaker edits under normal open window rules and the grant is no longer what constrains them. There is already a test for that case (the one smarcet raised on the CFP PR) and it now asserts the title too.

Mutation checked: reverting the title to isSubmissionReopened() alone fails that test and nothing else.

Also in here

• Explicit id="materials" on the Panel. uicore's Panel derives its DOM id from the title when none is passed, so a dynamic title would otherwise move the id every time a grant opens or closes.
• The reopen_submission_section label ("CFP submission window") inside the section is gone, along with its i18n key. The panel title already names the group and two stacked headings read as noise.
• renderEventForm in the test file expands the panel before asserting, because uicore's Panel mounts children only while expanded. It uses queryByText rather than getByText so the tests that assert the control is absent still exercise a real absence instead of passing on a collapsed panel.
• Test fixture gains materials: [], which the Table now actually maps over.

Verification

• 169 suites / 1510 tests pass. eslint clean (same pre-existing warnings, zero errors, matching the master baseline).
• Driven in the browser against api.dev.fnopen.com, summit 13 / activity 3535: both title states, the collapsed header, the expanded section in both grant states, and the explicit panel id confirmed on the live DOM. The grant opened for the screenshots was closed again and verified null on the server.

The docs side

The operator guide in the docs vault already follows the control into the Materials panel: the prose in steps 2 and 5, four reshot Show Admin screenshots, and two new ones for the collapsed heading and the close confirm. The speaker portal screenshots are untouched, since that is a different app this does not affect.

That is vault PR #121. It should not merge before this one, because until this ships it documents UI that is not deployed.

[coderabbitai]

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[Copilot]

Pull request overview

This PR refactors the Activity/Event form UI to move the CFP “reopen submission” controls into the Materials panel, and mirrors reopen-grant state in the Materials panel header so operators can still see the reopen status when the panel is collapsed.

Changes:

• Adds a dynamic Materials panel title (materials_reopened) when a reopen grant is active and the reopen section is applicable.
• Moves the reopen submission controls from the main form body into the Materials panel and pins the panel DOM id to a stable value (id="materials").
• Updates form tests/fixtures to expand the Materials panel when needed and to cover the new title behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/i18n/en.json	Adds materials_reopened translation key; removes unused section label key.
src/components/forms/event-form.js	Introduces shared visibility gate for reopen UI and moves the reopen controls into the Materials panel with a dynamic title and stable id.
src/components/forms/tests/event-form.test.js	Expands Materials panel in test helper, adds fixture data, and updates assertions for the moved UI/title.

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[santipalenque]

LGTM