fix(meadows): constrain tables and webhook empty state

Summary

• Constrain the Meadows index table to the content area so it does not create page-level horizontal scrolling.
• Fix Meadows table column sizing and repository badge truncation so long values stay inside the table.
• Restore Noora table empty-state icon sizing under Hive’s global box-sizing reset, and use the webhook icon for the Webhooks empty state.

Testing

• mix test test/hive_web/live/meadow_live/index_test.exs
• mix compile --warnings-as-errors
• git diff --check
• Headless Chrome verification with BrowseChrome against the compiled CSS: wrapper 32px, SVG 20px, centers aligned.

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