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fix(builtin): make StringView Show::output match Show::to_string

The trait doc for Show says output and to_string must produce the same
text. StringView violated this: output wrote an escaped, quoted form
(via escape_to) while to_string returned the raw view. Remove the
output override so the default — write_string(to_string()) — kicks in,
matching String's behavior.

SourceLocRepr::to_json_string was relying on the buggy escape to inject
JSON-string quoting around its filename field; switch it to call
escape_to explicitly so the JSON output is unchanged after the fix.

Add a test that verifies output and to_string agree for StringView
across plain ASCII, special characters, and multi-byte content.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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