Improve tab navigation flow for accessibility

[e1121208]

Restructured tabindex order to ensure a logical navigation sequence: focus now moves from the issue title to the description field, followed by the severity and type dropdowns, then the submit button before reaching less important form elements. Enhances usability for keyboard users and improves overall accessibility.

Summary:

Fixes #1266

Changes Made:

• Reordered the tab navigation sequence in the New Issue form for improved accessibility and user experience.
• Ensured that pressing Tab now correctly moves focus from the issue title input to the description editor, followed by the severity and type dropdowns, then finally the submit button.

Proposed Commit Message:

Improve tab navigation flow for accessibility

Restructured tabindex order to ensure a logical navigation sequence:
focus now moves from the issue title to the description field, followed
by the severity and type dropdowns, then the submit button before reaching less important form
elements. Enhances usability for keyboard users and improves overall
accessibility.