feat: auto-focus URL field when a request is opened

[Aanish-Bangre]

PR Description

This PR improves the request creation workflow by automatically focusing the URL input field when a new request is opened.

Currently, after pressing the + button to create a new request, users need to manually click the URL field before typing. With this change:

• The URL field receives focus immediately after a new request is created.
• The cursor is placed inside the field so users can start typing instantly.
• Focus works correctly on both desktop and smaller screen layouts.

Additionally, focus handling was improved to account for the drawer behavior on smaller screens. The URL field waits until the drawer closes before requesting focus to ensure the editor is visible.

This PR is opened as a fresh branch to preserve commit history after the previous PR was closed due to a rebased branch.

Before

API.Dash.before.mp4

After

2026-03-05.17-10-56.mp4

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Related Issues

• Closes Auto-focus URL field when creating a new request #1244

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Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I am using the latest Flutter stable branch (run flutter upgrade and verify)
• I have run the tests (flutter test) and all tests are passing

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Added/updated tests?

• No, and this is why: This change affects UI focus behavior and does not modify business logic or APIs.

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OS on which you have developed and tested the feature?

• Windows
• macOS
• Linux