feat(ui): auth monitor with real-time account flow visualization

[kaitranntt]

Summary

Complete redesign of the home page auth monitor with interactive flow visualization, real-time stats, and enhanced theming.

Key Features

Auth Monitor & Flow Visualization

• Interactive Flow Chart: SVG bezier curves connecting accounts to providers with smooth animations
• Draggable Cards: All account and provider cards are draggable with real-time curve recalculation
• Connection Timeline: Live feed showing recent request activity per account
• Per-Account Stats: Success/failure counts fetched from CLIProxy stats endpoint
• Pulse Animations: Traveling dot animation along paths when new requests are detected

Light Theme Contrast Improvements

• Darker foreground colors (0.2 → 0.15 OKLCH lightness)
• Enhanced muted-foreground (0.55 → 0.40) for better readability
• Darker borders (0.85 → 0.78) for better definition
• Status colors updated: green-700, amber-700, red-700 for light mode
• Account segment colors darkened ~25% for visibility

UI Enhancements

• Added documentation link button in header
• Removed excess whitespace from auth monitor container
• Improved hero section layout with inline stats

Files Changed (19 files, +1916/-273 lines)

Component	Description
account-flow-viz.tsx	New 782-line flow visualization component
auth-monitor.tsx	New 463-line live monitoring component
index.css	Enhanced animations, light theme CSS vars
home.tsx	Integrated auth monitor, improved layout
stats-fetcher.ts	Extended for per-account stats
provider-config.ts	Provider colors and display names
utils.ts	Status colors, model color generator
docs-link.tsx	New documentation button component

Technical Details

Animation System

• request-pulse: 2s duration with drop-shadow glow effect
• travel-dot: 1.5s traveling circle along bezier path
• glow-pulse: 2.5s box-shadow pulsing with scale transform
• Cubic-bezier easing for smooth motion

Data Flow

• 5s polling interval for near-real-time updates
• Per-account stats from /api/cliproxy/stats endpoint
• Activity detection triggers pulse animations

Test Plan

• Auth monitor displays on home page with real account data
• Drag cards → bezier curves update in real-time
• Light theme has sufficient contrast (WCAG compliant)
• Pulse animations trigger when request counts increase
• Connection timeline shows chronological activity
• Click account card → shows detail panel with stats
• Provider cards clickable → navigates to account flow view
• Docs button links to https://docs.ccs.kaitran.ca