fix : replace hardcoded text-black in DashboardTasks and TaskPreview duration modals

[tmdeveloper007]

Summary of What Needs to be Done

Replace hardcoded text-black class usages in the duration completion modal within frontend/src/components/Dashboard/DashboardTasks.jsx and frontend/src/components/Dashboard/TaskPreview.jsx with theme-aware text color classes.

Changes that Need to be Made

Replace hardcoded text-black and text-black/90 in the duration modal with text-main and text-muted following the existing dark-mode pattern.

DashboardTasks.jsx:

• text-black/90 -> text-main
• text-black (p tag) -> text-muted
• text-black (input) -> text-gray-900 dark:text-white
• text-black (cancel button) -> text-gray-700 dark:text-gray-200

TaskPreview.jsx:

• text-black/90 -> text-main
• text-black (p tag) -> text-muted
• text-black (input) -> text-gray-900 dark:text-white
• text-black (cancel button) -> text-gray-700 dark:text-gray-200

Impact that it would Provide

• Modal text is readable in dark mode
• Consistent dark-mode styling throughout the app
• Fixes visual accessibility issues in dark mode

Note: Please assign this issue to the tmdeveloper007 account.

[aaniya22]

pls assign this to me under gssoc

[sriharshitha128]

/assign

[github-actions]

Hi @sriharshitha128, please wait 6h before claiming this issue again (cooldown active).