Feature: Independent settings section saving - no password re-entry required

- Refactored SettingsWizard to allow saving each section separately (Email, Webhook, Monitoring)
- Each section now has its own Save button
- Removed global Save button - sections save independently
- No longer need to re-enter email passwords when changing other settings
- Added success/error status messages that appear for 3-5 seconds
- Status messages appear as toast notifications in top-right corner
- Updated CSS with save-status styling and slideIn animation
- handleSaveSection() only POSTs the relevant fields for that section

client/build/index.html

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-<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="/favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1"/><meta name="theme-color" content="#000000"/><meta name="description" content="SkyWatch - Infrastructure monitoring and alerting system"/><link rel="apple-touch-icon" href="/logo192.png"/><link rel="manifest" href="/manifest.json"/><title>SkyWatch</title><script defer="defer" src="/static/js/main.19ff8743.js"></script><link href="/static/css/main.2e6b09f5.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>
+<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="/favicon.ico"/><meta name="viewport" content="width=device-width,initial-scale=1"/><meta name="theme-color" content="#000000"/><meta name="description" content="SkyWatch - Infrastructure monitoring and alerting system"/><link rel="apple-touch-icon" href="/logo192.png"/><link rel="manifest" href="/manifest.json"/><title>SkyWatch</title><script defer="defer" src="/static/js/main.19943c37.js"></script><link href="/static/css/main.2bbac6b9.css" rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"></div></body></html>