refactor(web): remove redundant add-project cancel button

[UtkarshUsername]

What Changed

Removed the extra inline Cancel button from the add-project form in the sidebar.

Why

There is already another cancel button. The add-project toggle button switches into the cancel action when the form is open.
The inline Cancel button duplicates behavior that is already exposed by this add-project toggle. (You can also press Esc to cancel btw)
Removing it simplifies the UI and reduces duplicate controls for the same action.

UI Changes

Before:

After:

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes

Note

Remove Cancel button from add-project UI in Sidebar

Removes the Cancel button from the add-project section in Sidebar.tsx. Risk: users can no longer exit add-project mode or clear addProjectError via this control.

^{Macroscope summarized dbaa4a2.}

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