fix: improve Open Graph metadata and social link previews

[sprahasingh]

No description provided.

[codelens-gh]

CodeLens Pre-Review Analysis

Outcome: Completed with no actionable findings

2 hunks scanned · 5 similar past patterns found

Completed with no actionable findings. Historical comments were retrieved, but none could be credibly tied to a defect in the changed code.

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Generated by CodeLens. Historically grounded findings cite their source reviews; general analysis is labeled separately.

General change overview (not historical evidence)

Changed areas (2 files; +91/-1 lines):

• app/static/index.html (+15/-1)
• tests/test_social_metadata.py (+76/-0)
  Test files changed: tests/test_social_metadata.py

[codelens-gh]

CodeLens Pre-Review Analysis

Outcome: General analysis only; no relevant historical match

1 hunk scanned

No relevant indexed historical comments matched these changes. CodeLens is providing a general diff overview and is not asserting a defect.

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Generated by CodeLens. Historically grounded findings cite their source reviews; general analysis is labeled separately.

General change overview (not historical evidence)

Changed areas (1 files; +16/-2 lines):

• tests/test_social_metadata.py (+16/-2)
  Test files changed: tests/test_social_metadata.py