chore(release): prepare 8.x-1.0-rc2

[Decipher]

Summary

Release preparation for 8.x-1.0-rc2. The CHANGELOG gets its release header, and the "Temporary file location" description on both forms now says the same as the README section from #3619767.

Changes

• CHANGELOG.md: ## Unreleased becomes ## 8.x-1.0-rc2 - 2026-09-07, with two lines added under Changed for the README rewrite and the form text below.
• src/Form/SettingsForm.php and src/Hook/FieldConfigEditForm.php: the description no longer recommends private:// for image previews. Previews work under temporary:// since #3121826. It now gives the same advice as the README: temporary:// first, private:// when that does not suit the server, never public:// on a site with private files. The em dash is gone.

Testing

• make lint clean: PHPCS, PHPStan, Rector, Twig CS Fixer, ESLint, CSpell.
• SettingsFormTest (7 tests) renders the form with the new text.
• No test asserts the old description, so nothing else changes.

Summary by CodeRabbit

• Documentation
  • Updated release identification to version 8.x-1.0-rc2, dated September 7, 2026.
  • Clarified guidance for temporary file storage, including when to use temporary:// or private://.
  • Updated settings guidance to explain upload timing, image previews, and public URL considerations.
  • Removed outdated image-preview guidance.

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📥 Commits

Reviewing files that changed from the base of the PR and between c5e645d and efd33c8.

📒 Files selected for processing (3)

• CHANGELOG.md
• src/Form/SettingsForm.php
• src/Hook/FieldConfigEditForm.php

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📝 Walkthrough

Walkthrough

The change updates temporary file location guidance in two forms and records the related documentation changes in the changelog. It recommends temporary://, permits private:// as a fallback, and explains the risk of public:// before entity save.

Changes

Temporary file location guidance

Layer / File(s)	Summary
Temporary file guidance updates src/Form/SettingsForm.php, src/Hook/FieldConfigEditForm.php, CHANGELOG.md	The form descriptions now explain the upload and save flow, recommend temporary://, allow private:// as a fallback, and warn about public:// on private-file sites. The changelog records the release and documentation updates.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to efd33

The release notes and temporary-file guidance now consistently recommend temporary://, describe private:// as a fallback, and warn against temporary public exposure. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files. (1 skipped: 1 …
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the primary change: preparing the 8.x-1.0-rc2 release. It is concise and specific.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/rc2-release-prep

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.66%. Comparing base (c5e645d) to head (efd33c8).

Additional details and impacted files

@@           Coverage Diff            @@
##           8.x-1.x      #36   +/-   ##
========================================
  Coverage    83.66%   83.66%           
========================================
  Files           20       20           
  Lines          796      796           
========================================
  Hits           666      666           
  Misses         130      130           

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