feat(eduviz): Complete Eduviz Benchmark UI

[Dhara124]

Description

This Pull Request introduces the UI foundation for the EduViz Assessment Mode, a dedicated interface living alongside the OCR Arena that empowers evaluators to systematically grade handwritten coursework.

This update resolves a major architectural pivot requested by the pedagogical team: transitioning away from a global "full-document" evaluation to a granular, "per-block" assessment model. Every distinct paragraph, diagram, or drawn spelling error now dynamically tracks its own independent rubric scoring profile.

Key Features

• Per-Block Assessment Panel: Evaluators can fluidly click across different blocks (Text, Diagrams, or Error bounding boxes) directly on the Canvas. The right-hand panel accurately detects these selections and hot-swaps active data to exclusively evaluate that specific block.
• Deep Store Synchronization: Added bidirectional event listeners between the ocrChat canvas states and the eduvizSlice. Block selections on the canvas instantly synchronize into Redux to keep the panel UI contextually relevant.
• Global Evaluation Metadata: Consolidated a global toolbar across the bottom to assign overarching document properties (e.g., Subject, Language, Grade level), effectively reducing interface clutter.
• Unified Submission Hook: The submittal logic dynamically packages every standalone annotated block into an aggregated annotatedBlocks JSON cluster wrapped tightly alongside the global metadata for backend consumption.
• State Rehydration: Overhauled the load parser within fetchEduvizSessionById.fulfilled. Old legacy sessions dynamically unpack the newly-routed annotatedBlocks payload off the wire—seamlessly re-injecting drawn error boxes, canvas states, and rubric bindings directly upon browser reload.

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