fix(browse): preserve prettyscreenshot path after hide

[jbetala7]

Summary

• keep the explicit prettyscreenshot output path when --hide appears before it
• parse prettyscreenshot arguments with hide-selector values separated from positional args
• add regression coverage for --hide before path, trailing --hide selector, and stdout mode

Fixes #1378

Tests

• bun test browse/test/prettyscreenshot-args.test.ts
• git diff --check

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