[PHP] Preserve decoded URL suffixes in structured block markup

[adamziel]

Structured block URLs now replace only the mapped scheme, authority, and pathname prefix in the decoded URL value. The unmatched path, query, and fragment bytes reach the existing HTML, CSS, or block serializer unchanged.

StructuredBlockMarkupUrlProcessor uses WPURL::replace_base_url() as the semantic result, locates only source boundaries marked by literal delimiters, and reparses the edited URL before accepting it. Ambiguous source spellings stay unchanged, and the cautious token pass is skipped for that token so it cannot bypass the failed boundary check.

The rewriter caches only the selected mapping index. Each occurrence still computes its own source-preserving URL, so equal parsed URLs with different source spellings do not share rendered output. The selected mapping’s own source base is used instead of the first configured base.

This is stacked on #625.

Testing

cd tests
../vendor/bin/phpunit UrlRewriting

The URL-rewriting suite passes with 430 tests and 2,716 assertions (7 pre-existing skips). PHPStan, PHPCompatibility 7.4+, targeted PHPCS, and git diff --check pass.

[github-actions]

Pull pipeline performance — large-directory

Site: large-directory · 2,000+ plus targeted file-transfer scenarios files · 10,000 posts · 25,000 postmeta · PHP 8.5.9

Stage	PR	trunk	Δ	Status	Details
playground-sqlite-db-pull	10.05 s	9.77 s	⚪ +273 ms (+2.8%)	✓	condition=db-pull in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=lexer native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=selected trunk: condition=db-pull in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=lexer native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=selected
playground-sqlite-db-apply	3.82 s	3.81 s	⚪ +16 ms (+0.4%)	✓	condition=db-apply to SQLite in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=parser native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=verified native_ast=WP_MySQL_Native_Parser_Node sqlite_driver_parser=verified trunk: condition=db-apply to SQLite in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=parser native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=verified native_ast=WP_MySQL_Native_Parser_Node sqlite_driver_parser=verified
Total	13.87 s	13.58 s	⚪ +289 ms (+2.1%)

_{Numbers carry runner noise; treat single-run deltas as directional, not authoritative.}

_{📈 Trunk performance history — commit-by-commit timeline.}