Fix table cell size and other ui fixes

[danvergara]

Fix table cell size and other UI fixes

Description

I've been using the newest dblab version a lot at work and I've ran into some issues that I address in this PR.

Changes:

• Fix table cells size which are now responsive to max width present in the respective column
• Change focus to the result set view/panel after successful queries
• Fix the footer calculation, so the title box and the side viewport get the exact space
• Fix db tree graph collision by providing a guaranteed-unique id
• Set the first database as the default active one in the database tree

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Locally, against two different databases.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings