feat: sync grading table filters and selectors to URL with nuqs

[RichDom2185]

Description

Wires nuqs into the grading overview page so the table filters and dropdown selectors live in the URL — making a filtered/searched view shareable and reload-safe (previously all local useState, with a Redux mirror for the column filters).

• Add the nuqs dependency and mount NuqsAdapter (nuqs/adapters/react-router/v8) in RootLayout, inside the react-router data-router tree where useSearchParams is available.
• Dropdown selectors in Grading.tsx → useQueryState: ?showAll, ?myGroups (dynamic default !isAdmin && group !== null), ?pageSize.
• Grading table column filters → ?filters (JSON) and the assessment-name search → ?search in GradingSubmissionsTable.tsx.
• Make the URL the single source of truth for columnFilters and remove the now-redundant submissionsTableFilters Redux state (action / reducer / type / initial state / unit test) in its own commit.

Note: the filters parser (and its [] default) is defined at module scope so the default keeps a stable reference across renders — otherwise a fresh [] each render would spuriously change columnFilters and trigger a refetch loop.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

How to test

• yarn tsc -b — passes.
• yarn test — full suite green (759 tests / 91 files).
• Manual: open /courses/:courseId/grading, then
  • change the show / groups / page-size dropdowns → URL gains showAll / myGroups / pageSize;
  • type in the search box → after debounce, URL gains search;
  • enter Filter Mode and add/remove filter chips → URL filters round-trips (the progressStatus auto-strip still fires when not showing all submissions);
  • reload or open the URL in a fresh tab → all selectors, search, and filter chips restore. Defaults stay out of the URL.

Checklist

• I have tested this code

🤖 Generated with Claude Code

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