feat(get-help-statistics): adjust date/numeric picker logic

[adi-herwana-nus]

• clamp date ranges to valid values on user edit
• maintain date range if new start > previous end or vice versa
• adjust spreadsheet randomization management

[Copilot]

Pull request overview

This PR refactors the “Get Help” activity filters to share a common filter component, improves date-range editing behavior, updates validation messaging, and tweaks spreadsheet randomization clamping behavior.

Changes:

• Introduces a reusable GetHelpFilter core component (with preset date chips and range-clamping logic).
• Splits date validation messages into “invalid date” vs “end before start” across locales and translation descriptors.
• Adjusts spreadsheet randomization managers to clamp min/max based on which field was edited.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
client/locales/en.json	Updates/introduces validation strings for invalid dates and end-before-start.
client/locales/zh.json	Same validation string updates for Chinese locale.
client/locales/ko.json	Same validation string updates for Korean locale.
client/app/lib/translations/getHelp.ts	Adds endDateBeforeStartDate and updates invalidDateSelection message.
client/app/lib/components/core/GetHelpFilter.tsx	New shared filter UI + date range adjustment helper (getFilterForDateChange).
client/app/lib/components/core/test/GetHelpFilter.test.tsx	New tests for shared filter behavior and date change helper.
client/app/bundles/system/admin/instance/instance/pages/InstanceGetHelpActivityIndex.tsx	Uses new filter fields type + updated date validation messaging.
client/app/bundles/system/admin/instance/instance/components/misc/InstanceGetHelpFilter.tsx	Replaces bespoke filter UI with shared GetHelpFilter.
client/app/bundles/system/admin/admin/pages/SystemGetHelpActivityIndex.tsx	Uses new filter fields type + updated date validation messaging.
client/app/bundles/system/admin/admin/components/misc/SystemGetHelpFilter.tsx	Replaces bespoke filter UI with shared GetHelpFilter.
client/app/bundles/course/statistics/pages/StatisticsIndex/get_help/CourseGetHelpStatistics.tsx	Uses new filter fields type + updated date validation messaging.
client/app/bundles/course/statistics/pages/StatisticsIndex/get_help/CourseGetHelpFilter.tsx	Replaces bespoke filter UI with shared GetHelpFilter.
client/app/bundles/course/assessment/question/text-responses/components/SpreadsheetRandomizationManager.tsx	Clamps numeric/date min/max based on which input was edited.
client/app/bundles/course/assessment/question/text-responses/components/NumericRandomizationManager.tsx	Changes onBlur signature to report which key blurred.
client/app/bundles/course/assessment/question/text-responses/components/DateRandomizationManager.tsx	Changes onBlur signature to report which key blurred.

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