Miscellaneous styling bugs

[loiswells97]

• Secondary button text in themed modal
• Hit area around the step buttons
• Line highlighting weirdness when the line is longer than the container
• Image widths
• Save status gap between icon and text
• Right border on project bar cut off (Added to Project bar styling fixes #829)
• Disappearing borders on tablet at width < 632px
• We need to think more about what happens to the title in tablet mode when the sidebar is fully opened - at the moment buttons get cut off and the title wraps weirdly (Added to Project bar styling fixes #829)

[create-issue-branch]

Branch issues/826-Miscellaneous_styling_bugs created!