feat: implement time tracking with pomodoro timer integration per task (#2932)

[desireddymohithreddy0925]

Summary

Integrates a Pomodoro timer directly into task cards to allow developers to log time entries and generate weekly timesheets.

Closes #2932

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Type of Change

• ✨ New feature (non-breaking change that adds functionality)

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What Changed

• Added a time_entries table in Supabase for tracking task-based durations.
• Built a PomodoroTimer component supporting 25/5/15 minute intervals with localStorage persistence.
• Added a "Time Logged" summary to task cards and a weekly timesheet report.

[github-actions]

GSSoC Label Checklist 🏷️

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