Reasons for creating this PR

Sidebar Vue components have incorrect initial height and width before load and often incorrect width after load. This PR fixes the component sizing.

Link to relevant issue(s), if any

• Part of Epic: Hierarchical View Sidebar Tab #1521 and Epic: Alphabetical View Sidebar Tab #1563

Description of the changes in this PR

• Fix setting sidebar width in alphabetical, hierarchical, groups and changes tabs
• Fix setting initial sizing for sidebar in alphabetical and changes tabs

Addresses requirement 3k in #1521 and 1c in #1563

Known problems or uncertainties in this PR

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)