Study Mode 1.1: community hardening and quiz UX

[CallSohail]

Study Mode 1.1 incorporates the main compatibility and UX feedback from the community.

Highlights:

• improve quiz reliability for local/smaller models with bounded Compatible parsing plus optional Strict mode
• add multilingual quiz-intent detection while keeping Quiz style keyword-independent
• scope Study Mode/quiz instructions more carefully around existing system prompts and add merge/separate integration modes
• add optional MathJax 3.2.2 LaTeX rendering with CSP/network fallback
• add keyboard controls, fullscreen, and client-side HTML export
• harden stream/status lifecycle, request-local quiz state, U+2028/U+2029 escaping, and DOM clearing
• prevent tolerant unmarked-JSON recovery from activating on non-quiz turns
• add permanent Study Mode regression tests and GitHub Actions validation
• update plugin/root documentation and release metadata to 1.1.0
• update repository Quick Actions listing to 3.0.1

Compatibility note: the tolerant parser is intended to improve behavior on models that produce near-valid structured output, but this PR does not claim model-specific validation on Gemma-4-26B-MoE until it is tested on an actual deployment.

Minimum Open WebUI remains 0.11.1.