Add AI comment selection, LLM feedback, and usage stats dashboard

[tzj04]

Summary

This PR adds AI-assisted grading comment UX, LLM feedback submission, and ground-control LLM usage monitoring UI.

What Changed

• Added interactive AI comment selection in grading flow.
• Added word-level diffing and inline editor synchronization improvements.
• Added save guards around selected AI comment persistence.
• Added LLM feedback submission UI in grading.
• Added LLM request/response typings and request handlers.
• Added ground control LLM usage stats views and dialog.
• Refactored API call path for chosen comments to answer-based endpoint.

Frontend Scope

• Grading UI:
  • src/pages/academy/grading/subcomponents/GradingEditor.tsx
  • src/pages/academy/grading/subcomponents/GradingCommentSelector.tsx
  • src/pages/academy/grading/subcomponents/GradingWorkspace.tsx
  • src/pages/academy/grading/subcomponents/LLMFeedbackButton.tsx
• Request + types:
  • src/commons/sagas/RequestsSaga.ts
  • src/commons/assessment/AssessmentTypes.ts
• Ground control stats:
  • src/pages/academy/groundControl/GroundControl.tsx
  • src/pages/academy/groundControl/subcomponents/GroundControlLLMStatsCell.tsx
  • src/pages/academy/groundControl/subcomponents/LLMStatsDialog.tsx
• Styling:
  • src/styles/GradingCommentSelector.module.scss

[github-actions]

Pull Request Test Coverage Report for Build 23139665438

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 5 of 23 (21.74%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.09%) to 41.148%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/commons/sagas/RequestsSaga.ts	5	23	21.74%

Files with Coverage Reduction	New Missed Lines	%
src/commons/sagas/RequestsSaga.ts	1	13.06%
src/commons/sideContent/content/SideContentCseMachine.tsx	3	38.78%

Totals
Change from base Build 23139498282:	-0.09%
Covered Lines:	5431
Relevant Lines:	12249

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💛 - Coveralls

[Copilot]

Pull request overview

This PR introduces AI-assisted grading UX for selecting/editing generated comments, adds an in-grading LLM feedback submission dialog, and adds a ground-control UI for monitoring LLM usage statistics and feedback.

Changes:

• Adds selectable AI comment suggestions in grading, with persistence of chosen indices + edited text.
• Adds LLM feedback submission UI in grading and new request handlers/typings for LLM stats + feedback.
• Adds a ground control “LLM statistics” cell and drill-down dialog for assessment/task usage + feedback.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/styles/GradingCommentSelector.module.scss	Adds styles for selectable comment rows, edit/diff preview styling, and selected state.
src/pages/academy/groundControl/subcomponents/LLMStatsDialog.tsx	New dialog to display assessment/task LLM usage stats and feedback lists.
src/pages/academy/groundControl/subcomponents/GroundControlLLMStatsCell.tsx	New control cell to open the LLM stats dialog when LLM grading is enabled.
src/pages/academy/groundControl/GroundControl.tsx	Wires the new LLM stats cell into the ground control row actions.
src/pages/academy/grading/subcomponents/LLMFeedbackButton.tsx	New dialog/button for graders to submit rating + feedback on LLM comments.
src/pages/academy/grading/subcomponents/GradingWorkspace.tsx	Passes assessmentId down to the grading editor to support feedback submission.
src/pages/academy/grading/subcomponents/GradingEditor.tsx	Major refactor: selection-by-index, editor synchronization via internal markers, save guards, and feedback button integration.
src/pages/academy/grading/subcomponents/GradingCommentSelector.tsx	Updates selector UI to checkbox-based selection and selected-row styling.
src/commons/sagas/RequestsSaga.ts	Adds request helpers for saving chosen comments + fetching/submitting LLM stats/feedback; replaces prior save-final-comment API call.
src/commons/assessment/AssessmentTypes.ts	Extends AssessmentOverview with isLlmGraded for conditional LLM stats UI.

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[martin-henz]

/gemini review

[gemini-code-assist]

Code Review

This pull request implements LLM usage tracking and AI-assisted grading, adding a course-wide statistics dashboard, configurable token costs, and an updated grading editor for selecting and editing AI-generated comments. Key feedback includes addressing potential CSV corruption in report downloads due to missing field escaping, refactoring the fragile use of invisible Unicode delimiters for parsing comment strings in the editor, and improving the robustness of request ID generation currently relying on non-unique timestamps.