Fix preview site component

[nightnei]

Related issues

• Fixes STU-850

Proposed Changes

1. This PR fixes mentioned bug with texts which has 2+ lines
2. Also, I noticed broken "Open site" link (see testing instructions), so it fixes it too

Testing Instructions

Apply the next diff:

diff --git a/src/components/content-tab-overview.tsx b/src/components/content-tab-overview.tsx
index d47aa219..5474c3a2 100644
--- a/src/components/content-tab-overview.tsx
+++ b/src/components/content-tab-overview.tsx
@@ -208,7 +208,7 @@ export function ContentTabOverview( { selectedSite }: ContentTabOverviewProps )
        const thumbnailImage = (
                <img
                        onError={ () => setIsThumbnailError( true ) }
-                       onLoad={ () => setIsThumbnailError( false ) }
+                       onLoad={ () => setIsThumbnailError( true ) }
                        className="w-full h-full"
                        src={ thumbnailData || '' }
                        alt={ themeDetails?.name }

1. Create a site and open Overview
2. Mouseover on preview
3. Assert that it looks good

BEFORE	AFTER

4. Change language to "Українська"
5. Assert that it's centered

BEFORE	AFTER

[github-actions]

📊 Performance Test Results

Comparing 475e20b vs trunk

site-editor

Metric	trunk	475e20b	Diff	Change
load	10971.00 ms	7739.00 ms	-3232.00 ms	🟢 -29.5%

site-startup

Metric	trunk	475e20b	Diff	Change
siteCreation	17363.00 ms	16314.00 ms	-1049.00 ms	🟢 -6.0%
siteStartup	7009.00 ms	7042.00 ms	+33.00 ms	🔴 0.5%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change

[gavande1]

I tested this and it works as expected. LGTM 👍