Add active site icons to the UI

[youknowriad]

Adds active site icons to the sidebar list and collapsed site header so the current site remains identifiable in compact layouts.

Proposed Changes

• Adds a reusable SiteIcon component for compact site identity in UI chrome.
• Shows the icon next to the active site title in the sidebar list with an animated transition.
• Shows the same icon in the site status dropdown header when the sidebar is collapsed on session and site settings views.

Testing Instructions

• Open Studio with multiple sites and confirm the active site row in the sidebar shows its icon next to the site title.
• Switch between sites and confirm the icon transition does not shift the surrounding sidebar layout unexpectedly.
• Collapse the sidebar and confirm the session and site settings headers show the active site icon in the status dropdown trigger.
• Check a site without a custom icon and confirm the fallback icon still looks aligned and legible.

Automated Checks

• npx eslint --fix apps/ui/src/components/session-view/index.tsx apps/ui/src/components/session-view/style.module.css apps/ui/src/components/site-dropdown/dropdown-trigger.module.css apps/ui/src/components/site-dropdown/dropdown-trigger.tsx apps/ui/src/components/site-dropdown/index.tsx apps/ui/src/components/site-list/index.tsx apps/ui/src/components/site-list/style.module.css apps/ui/src/components/site-settings-view/index.tsx apps/ui/src/components/site-icon/index.tsx apps/ui/src/components/site-icon/style.module.css
• npm run typecheck
• npm test -- --passWithNoTests apps/ui/src/components/site-list apps/ui/src/components/site-dropdown apps/ui/src/components/session-view apps/ui/src/components/site-settings-view

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[wpmobilebot]

📊 Performance Test Results

Comparing 592c282 vs trunk

app-size

Metric	trunk	592c282	Diff	Change
App Size (Mac)	1453.95 MB	1453.95 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	592c282	Diff	Change
load	1904 ms	1813 ms	91 ms	🟢 -4.8%

site-startup

Metric	trunk	592c282	Diff	Change
siteCreation	8087 ms	8084 ms	3 ms	⚪ 0.0%
siteStartup	4951 ms	4959 ms	+8 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)