Improve Cadmin UI/UX: streamline navigation, reduce clutter, add filtering

[Copilot]

Streamlines the course admin interface by removing redundant information, improving navigation patterns, and adding search/filter capabilities for submissions.

Changes

Course Admin Page

• Homework/project titles now link directly to submissions (removed redundant "Submissions" button)
• Added icon link to public page view
• Merged submission/review due dates into single column (date only, no time)
• Replaced button groups with state-aware dropdowns (e.g., "Assign Reviews" only appears when state is "Collecting Submissions")

Submission Pages (Homework & Project)

• Removed redundant "Student" column (username duplicates email)
• Added "Log in as" button for quick user impersonation via django-loginas
• Added client-side sorting and email filtering
• Project submissions: removed "Time Spent" and "Submitted At" columns

Project Submission Edit

• "Passed" checkbox now auto-toggles when total score crosses passing threshold
• JavaScript maintains score calculation consistency

Screenshots

Course Admin - Before/After showing dropdown actions and consolidated dates:

Homework Submissions - Showing filtering and "Log in as" button:

Project Submissions - Reduced columns, added sorting:

Project Edit - Auto-check behavior:

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Cadmin UI/UX improvement</issue_title>
<issue_description>A few things I want to improve:

• see submissions is not really an action. let's go to tthe sumissions page when we click on the homework/project name and have an icon to go to the actual homework/project in cmp (the view for everyone)
• submission and peer review due dates - let's have them in one column. just day is enough
• make actions a drop down list with button "apply" or something like that. assign review and scrore should be available only when the state is suitable for this action
• in project submissions, we have student and email - it's the same. let's use just email
• for both homework and project where we have emails let's have a button "log in as user" - we already have this functionality in Django admin but it's difficult to find usually, here it would be way faster
• Time Spent (hours) and Submitted At we can remove - not useful for now
• add ways to sort and quickly find submissions
• for submission edit - when we adjust the project score and it moves the points to pass thereshold it should automatically select the checkbox "passed" </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Cadmin UI/UX improvement #136

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