Show a lock beside protected articles in the wiki's lists

[bonelifer]

Protection (#78) showed only on the article itself. Now the overview, Recent changes, the wiki search results, the wiki block in phpBB's search and the category pages put a lock beside a protected article's title. Hovering it, or a screen reader, says which groups may edit it. The protected articles are read once per page (protection::list_label()), not once per row. The note's string moves to link.php, which every page loads, so phpBB's own search page can use it.

The article page also gets a Protect button (a padlock beside Edit, Versions and Watch) for members who may protect, so it's no longer only in the version history's moderator controls. It shows an open padlock when the article isn't protected, and a closed red one ("Protected: change who may edit") when it is.

Screenshots: wiki-protected-article.png is retaken to show the Protect button, and wiki-protected-list.png shows the lock in Recent changes.

Claude tested it:

• Unit tests on phpBB 3.3 and master, with a database test for the labels: groups A to Z, and a change showing straight away.
• On the seed-forum 3.3 board, with two articles protected for different groups: the lock and its text on the overview, Recent changes, a category page, the categories list, the wiki search and the board-search block. The search index had to be built first, as the seed fixtures leave it empty.
• The Protect button on the article page: open padlock, then the Protect page, then a closed red padlock once saved; no button for guests.
• On the seed-forum 4.0 board: the overview and Recent changes.

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Investigated and written by Claude on behalf of William Jacoby (bonelifer).

🤖 Generated with Claude Code