Fix/bughunt reem19 15#16

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Reem19-15 wants to merge 12 commits intoJavaScript-Mastery-Pro:mainfrom

Reem19-15:fix/bughunt-Reem19-15

Commits on Apr 20, 2026

fix: defer MongoDB env validation to prevent build failure
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fix: enforce Zod validation and prevent field injection on student creation
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security: scope student mutations to authenticated teacher
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security: scope assignment mutations to authenticated teacher
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harden: replace error stack trace with generic message in assignments GET
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security: scope announcement mutations to authenticated teacher
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security: scope grade mutations to authenticated teacher and fix recalculation
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fix: add missing await to grade upsert, correct A+ threshold, remove stack traces
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security: remove arbitrary userId query param from profile GET
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fix: stabilize navbar theme initialization to prevent hydration mismatch
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fix: include teacherId in attendance unique index to prevent cross-teacher conflicts
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refactor: migrate middleware to proxy for Next 16 support
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