fix: add accessibility improvements under to-do list - resolves #3099

[aaradhyasinghai-ux]

TO-DO LIST FIXES -

[ ] FIX 1 — aria-label added to 5 theme buttons (section 1)
[ ] FIX 2 — sr-only label + aria-label added to input & select (section 1)
[ ] FIX 3 — aria-label on Add Task + Save PDF buttons, aria-hidden on icons (section 1)
[ ] FIX 4 — sr-only label + aria-label added to input & select (section 2)
[ ] FIX 5 — aria-label on Add Task + Save PDF buttons (section 2)
[ ] FIX 6 — role + aria-label on 3 drop zones (section 2)
[ ] FIX 7 — role + aria attributes on progress bar (section 2)
[ ] FIX 8 — .sr-only CSS added to todolist.css

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[aaradhyasinghai-ux]

Hey @dhairyagothi,
I have completed the accessibility improvements and raised the PR.
Merge conflicts have also been resolved successfully. Kindly review it. Thank you!

[dhairyagothi]

Mention the issue no on which you have worked

Don't raise PR against the issue which is not assigned to you and without raising issue

[aaradhyasinghai-ux]

Hi @dhairyagothi, I have worked on Issue #3099, which was assigned to me by you, and raised the PR for it.
Merge conflicts have also been resolved successfully.
Kindly review it when possible.

[aaradhyasinghai-ux]

Hi @dhairyagothi,
Merge conflicts have been resolved successfully.
Kindly review it when possible.

[dhairyagothi]

Please resolve merge conflicts before this PR can be merged.

[aaradhyasinghai-ux]

Hey @dhairyagothi, resolved the merge conflicts in both files.
For todolist.css, accepted both changes since the .sr-only class I added and the reset styles from Main don't interfere with each other. For todolist.html, kept my branch's version as it has the accessibility attributes (aria-label, semantic IDs) that this PR is built around.
Let me know if anything looks off!

[aaradhyasinghai-ux]

Hey @dhairyagothi,
Resolved the merge conflicts, Please review the PR.