fix : replace alert calls with toast notifications in RoutineCard

[tmdeveloper007]

Summary of What Needs to be Done

Replace all remaining browser alert() calls in frontend/src/components/Routine/RoutineCard.jsx with the existing inline toast notification system (triggerToast function) for a non-blocking user experience.

Changes that Need to be Made

The file already has toast infrastructure (triggerToast function, showToast state). Replace these 4 alert calls with triggerToast calls:

• alert("Failed to copy share link") -> triggerToast("Error", "Failed to copy share link")
• alert("Failed to copy routine summary") -> triggerToast("Error", "Failed to copy routine summary")
• alert("Failed to export routine as PDF") -> triggerToast("Error", "Failed to export routine as PDF")
• alert("Failed to delete routine") -> triggerToast("Error", "Failed to delete routine")

The toast UI already exists. Consider adding a red-dot indicator to distinguish error toasts from success toasts.

Impact that it would Provide

• Eliminates blocking browser alert dialogs for error cases
• Consistent UX with other toast notifications in the app
• Better user experience on mobile and desktop

Note: Please assign this issue to the tmdeveloper007 account.

[aaniya22]

pls assign this to me under gssoc