Released version 4.1.5

This release adds an immutable date/time class, makes file writes safer, background processes possible, and Finder masks smarter. Plus a couple of bug fixes worth picking up.

✨ New Features

• DateTimeImmutable – a new immutable counterpart to Nette\Utils\DateTime. It extends PHP's \DateTimeImmutable with strict validation (invalid dates and times throw instead of being silently rolled over), convenient factories from() and fromParts(), DST-safe relative modifications, and JSON serialization.
• FileSystem::writeAtomic() – writes a file atomically via a temporary file and rename, so a concurrent reader never sees it partially written or truncated. Ideal for caches and generated configs.
• Process::detach() – lets a process keep running in the background after the Process object is destroyed, instead of being killed by the destructor. Output must go to a file or be discarded, since nobody reads the pipes after detaching.
• Process – on Windows with PHP 8.5, captured output now flows through real pipes instead of temporary files, thanks to the fixed stream_select().
• Html::fragment() and add() – create a nameless element pre-filled with children, or append children to an existing element. Unlike addHtml(), plain strings are escaped by default and nulls are skipped.
• Html::text() and Html::html() – new static factories replacing fromText() and fromHtml(), which are now deprecated.
• Finder – the mask now fully drives recursion: **/foo together with in() searches recursively, and the ** short form expands like in zsh, so test/** means test/**/* and **.c means **/*.c (previously such masks silently degraded to a single *).
• Finder – a trailing slash in a find() mask matches directories only: find('temp/').
• Finder::exclude() – now uses the same mask grammar as find(): **.txt works, ./ anchors to the search root, and a trailing /, /* or /** controls whether the directory itself, its contents, or both are excluded.
• Finder – paths are no longer normalized to forward slashes; they stay in their native form, which also fixes corruption of backslashes in POSIX file names. Note: on Windows, returned paths may now contain backslashes where they used to be unified.

🐛 Bug Fixes

• ArrayList::prepend() – no longer misbehaves on an empty list.
• Validators::isUrl() – now rejects malformed IPv4 addresses with octets above 255, so nonsense like http://999.1.1.1 no longer passes as a valid URL.
• Strings::compare() – tolerates invalid UTF-8 instead of failing when the Normalizer gives up.
• Strings::length() – the fallback used when neither mbstring nor iconv is available no longer relies on the deprecated utf8_decode(), so it stays quiet on PHP 8.2+.
• Finder::exclude() – exclude('subdir/') silently excluded nothing due to a greedy regex; the trailing /, /* and /** variants now work as documented.