refactor(legal): apply frosted glass design and improve UI components

Summary

• Apply consistent frosted glass (glassmorphism) styling across all agent dashboards
• Add responsive layout support with xxl breakpoint for QHD/UWQHD screens (2560px+)
• Refactor agents to use shared Grid 2/10 layout and IntegrationTabs patterns
• Enforce ConditionalComponent pattern for conditional rendering consistency

Changes

SEO Agent

• Remove Container/Box wrappers from page for consistent sizing with AAG/SAV
• Update getGlassmorphismCard to use ::before top gradient (matching SAV)
• Replace all getGlowyCardEffect usages with getGlassmorphismCard across audit reports, article generator, and analytics
• Fix dropdown clipping in audit reports and article list by setting overflow: visible
• Fix plus icon placement in article configuration tag inputs

Legal Agent

• Apply frosted glass design to all UI components
• Improve component styling consistency

SAV Agent

• Apply frosted glass design and responsive layout
• Align with AAG reference pattern

Community Manager

• Replace AgentLayout/AgentSidebar (flexbox) with Grid 2/10 layout matching AAG/SAV
• Switch from AgentTabs to IntegrationTabs for consistent tab styling
• Fix purple theme fallback by setting initialAgent="ziri" on AgentThemeProvider
• Add spacing between tab menu and content

Aren Agent

• Apply frosted glass design and responsive layout

Document Analysis Agent

• Apply frosted glass design and responsive layout

AAG Agent

• Rename folder from AAG to aag for naming consistency

Theme & Responsive

• Add xxl: 2560 breakpoint for QHD/UWQHD support
• Create responsive utilities for consistent breakpoint values
• Update AgentLayout and AgentSidebar with xxl breakpoint support

Shared Components

• Update ChatDashboard component with Grid 2/10 layout improvements
• Update error, loading, and not-found pages with improved glassmorphism design
• Update collaborators list with improved styling
• Replace {condition && } patterns with ConditionalComponent

Configuration & Context

• Update wizard steps configuration
• Update agent theme context

Closes IAV-897