Redesign user pages with page toppers and dynamic search

[maebeale]

What is the goal of this PR and why is this important?

• Bring user pages in line with the person/org page designs (page topper banners, white card sections, consistent spacing)
• Add dynamic live search to the users index so filtering is instant without full page reloads

How did you approach the change?

Page topper banners (show, edit, new)

• Added DomainTheme-based colored banner headers matching the person/org pattern
• Applied domain background color to page body

Edit page identity header

• Redesigned with avatar, bold email, person link, and right-aligned action buttons (Reset password, Resend invite, Change password)
• Used form_class: "inline" on button_to to fix flex layout issues

Form reorganization

• Wrapped form sections into white cards: Account Details, Notes, Preferences, Comments
• Added "Account flags" label above Lock/Admin checkboxes
• Removed redundant displayed name fields (kept hidden fields for form submission)

Dynamic search (index)

• Replaced static table with Turbo Frame (turbo_frame_tag :users_results) and skeleton loader
• Added Stimulus collection controller for debounced text search (400ms) and immediate select submission
• Controller branches on turbo_frame_request? to render results partial
• Count updates dynamically via turbo_stream.replace
• Reordered columns: email (bold, primary) first, person second

UI Testing Checklist

• Visit users index, verify skeleton loader appears briefly then results load
• Type in search box, verify results update after typing stops (debounced)
• Change Access/Permission level dropdowns, verify immediate filtering
• Click "Clear filters", verify all filters reset and results reload
• Verify pagination works within turbo frame
• Visit user show page, verify page topper banner and white card layout
• Visit user edit page, verify banner, identity header with action buttons
• Visit new user page, verify banner displays
• Verify links within turbo frame (Edit, View, Create person, Invite) navigate correctly

Anything else to add?

Nothing additional.

🤖 Generated with Claude Code