style: manual UI tweaks (users/companies headers, wider layout, user-view, projects index)
User's manual changes: header slots with New-user/New-company actions, wider max-w-7xl containers on /admin/users and /companies, plus tweaks to user-view and projects index views. All views compile. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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