[FEATURE] [MER-5611] Select all students in the support tile bucket

[nicocirio]

Jira

• Ticket: https://eliterate.atlassian.net/browse/MER-5611

Summary

• update the Student Support tile master checkbox to select all students in the current bucket/filter result, not just the visible page
• show Select all (# students) when the master checkbox is checked to clarify the full selection scope
• keep selected recipients available for the email modal even when some selected students are not yet visible due to pagination
• update support tile work-item docs to record the MER-5611 behavior change from the original MER-5252 scope

What Was Added

• support tile state now tracks the full filtered student set so select-all can operate across pagination
• the checked-state label now reflects the total selected scope for the current bucket/filter result
• support tile tests now cover cross-page selection and email recipient population for non-visible students
• support tile work-item docs now reflect the MER-5611 behavior change and preserve the prior MER-5252 scope as historical context

Validation

• mix format
• mix compile
• yarn --cwd assets run format
• yarn --cwd assets run deploy
• mix test test/oli_web/components/delivery/instructor_dashboard/student_support_tile_test.exs test/oli_web/components/delivery/instructor_dashboard/student_support_email_modal_test.exs
• python3 /Users/nicocirio/.local/share/harness/skills/validate/scripts/validate_work_item.py docs/exec-plans/current/epics/intelligent_dashboard/support_tile --check all

Video Evidence

Screen.Recording.2026-05-06.at.11.19.05.AM.mov

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