Fix: Manual year input and free navigation in 'TaskFormModal.jsx' due date picker

[Dhruvi-02]

📌 Description

The due date picker in 'TaskFormModal.jsx' lacked a manual year input field, forcing users to navigate through decade-based grids to reach a specific year. This fix adds a free-text year input and restores full view-switching between day, month and year grids.

🔗 Related Issue

Closes #1441

🛠️ Changes Made

• Added 'typedYear' state to track manual text input for year selection.
• Added a 4-digit text input field inside the year view for direct year entry.
• Calendar now auto-jumps to the typed year as soon as 4 valid digits are entered.
• Enable smooth switching between day grid, month grid and year grid views.
• Clicking the month name in the header toggles the month grid view.
• Clicking the year in the header toggles the year grid view with decade navigation via chevrons.
• Removed hardcoded year range restriction so the users can now reach any year by typing or navigating freely.

🖼️ Screenshots (if applicable)

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✅ Checklist

• Code runs locally
• Followed project structure
• No console errors
• Properly tested changes
• Linked the issue