test: add tests to catch #4637

Issue #4637 was fixed in 7686f2030b19f948d2e50df1613ef6592fa44b46 but I
didn't like that no test had caught the issue.

This adds a specific test for the issue as a Ha

test: add tests to catch #4637

Issue #4637 was fixed in 7686f2030b19f948d2e50df1613ef6592fa44b46 but I
didn't like that no test had caught the issue.

This adds a specific test for the issue as a HandlerTest. Additionally a
simple smoke test is added that renders the wiki:syntax page and
inspects the created DOM. It's not comprehensive but might help flagging
similar issue in the future.

show more ...

move handler methods into ParserMode classes and rename Handler

Each ParserMode class now implements handle() from ModeInterface,
containing the token handling logic that previously lived as individ

move handler methods into ParserMode classes and rename Handler

Each ParserMode class now implements handle() from ModeInterface,
containing the token handling logic that previously lived as individual
methods on Doku_Handler.

The Handler class (formerly Doku_Handler) is the single dispatch point:
Lexer passes tokens to Handler::handleToken() which routes to mode
objects, plugins, or returns false. The Lexer only tokenizes and
resolves mapHandler aliases.

Key changes:
- Add handle() to ModeInterface, implemented by all mode classes
- Move Doku_Handler to dokuwiki\Parsing\Handler namespace
- File extends Code (shared parsing via $type property)
- Quotes uses mapHandler() + Handler::getModeName() for sub-modes
- Media::parseMedia() replaces Doku_Handler_Parse_Media()
- Code::parseHighlightOptions() replaces parse_highlight_options()
- Per-parse state (footnote, doublequote) stays on Handler
- Deprecated wrappers kept for base/header/internallink/media
- Class alias and rector rules added for backward compatibility

show more ...