PR 6: refactor: per-area small refactors (CTS, Scheduler, Students, CMS)

[rlorenzo]

Summary

Part 6 of 6. Stacks on top of PR #177 (parallel to PR #178). The smallest PR in the stack — 9 files, 4 self-contained refactors.

Each commit is a small per-area dedup driven by jscpd findings on the original code-anaylsis branch.

Commits

• refactor(cts): collapse hardcoded CourseStudents rows into a v-for — replace 5 near-identical <tr> blocks with a single v-for.
• refactor(scheduler): share schedule filter LINQ via IScheduleEntity — introduce IScheduleEntity + ScheduleQueryExtensions so the by-clinician / by-rotation / by-week scheduling queries share their filter LINQ.
• refactor(students): consolidate StudentGroupService photo + Ross helpers — extract BuildStudentPhotoListAsync, FormatStudentDisplayName, FormatGroupAssignment, ResolvePhotoUrl, and GetActiveRossIamIdsAsync so the by-class-level / by-group / by-course paths no longer hand-roll the same logic.
• refactor(cms): collapse Codecs UU/XX encoders onto shared map helpers — collapse 4 near-identical UU/XX encode/decode methods into 2 generic helpers (DecodeWithMap, EncodeWithMap) keyed by the encoding map.

Conflict resolution notes

Two cherry-picks needed conflict resolution because PR 3's analyzer cleanup ran ahead of these refactors in the original chronology, and the analyzer fixes touched the pre-refactor code shape:

• StudentGroupService.cs: took the refactor's structure, then re-applied PR 3's analyzer fixes to the new helper (SqlException short qualifier, !string.IsNullOrEmpty(id) over id != null, sealed record StudentBaseRecord).
• Codecs.cs: took the refactor's consolidated structure with Stream qualifiers shortened (the file's implicit-usings setup makes using System.IO; unnecessary).

Net effect: each file ends up at the same end-state as on the original code-anaylsis branch.

PR stack

• PR 1 → tooling: fallow + jscpd (PR 1: feat(tooling): add fallow + jscpd with regression-gated CI #174)
• PR 2 → tooling: CodeQL + Roslyn + ReSharper (PR 2: chore(quality): add C# analyzers + ReSharper PR gate #175)
• PR 3 → quality: bulk analyzer cleanup (PR 3: chore(quality): mechanical analyzer-driven cleanup (453 files) #176)
• PR 4 → refactor: dead-code + shared chrome (PR 4: refactor: dead-code removal + shared chrome extraction #177)
• PR 5 → refactor: Effort component extraction (PR 5: refactor(effort): component extraction + report context centralization #178)
• PR 6 (this) → refactor: per-area small

Test plan

• CI green
• CTS course students table renders correctly (5+ students)
• Clinical Scheduler: by-clinician / by-rotation / by-week views still filter the same set
• Students photo gallery: by-class-level / by-group / by-course flows match prior behavior; Ross students excluded/included as before
• CMS Codecs: round-trip a UU and XX encode/decode against a known fixture

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