Report preview timestamp parse errors

[dreikanter]

Changes:

• Report malformed preview timestamps through Rails.error instead of writing an isolated warning log.
• Keep returning nil so an invalid timestamp does not break preview rendering.

Why:

Handled exceptions should still reach the application's error-reporting pipeline.

References:

• Related issue: Review the code structure #1010 (F-066)

Checks:

• User-facing fallback behavior is unchanged.
• GitHub Actions will verify the branch.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.55%. Comparing base (ce0547a) to head (1134896).

Files with missing lines	Patch %	Lines
app/components/post_preview_component.rb	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1085   +/-   ##
=======================================
  Coverage   97.55%   97.55%           
=======================================
  Files         355      355           
  Lines        8358     8358           
=======================================
  Hits         8154     8154           
  Misses        204      204           

Files with missing lines	Coverage Δ
app/components/post_preview_component.rb	92.20% <0.00%> (ø)

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