Fix workflow placeholders and icons

[thomtrp]

• allow all form fields that may need a placeholder to set it
• update main icons on versions and runs

[greptile-apps]

PR Summary

This PR standardizes form field placeholders and updates workflow-related icons across the Twenty application.

• Added consistent placeholder support to form field components (FormDateFieldInput, FormLinksFieldInput, FormNumberFieldInput, etc.) with default fallbacks
• Centralized form field default settings through getDefaultFormFieldSettings utility
• Changed workflow icons: workflowRun to IconHistoryToggle and workflowVersion to IconVersions for better visual representation
• Refactored header icon handling to use useRecordShowPage hook instead of prop passing
• Fixed placeholder handling in WorkflowEditActionFormBuilder with proper null checks and type safety

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[martmull]

lgtm

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Error: Workflow is not enabled. If you want to use it, please enable it in the lab. /object/workflow/d25c009a-2dae-499e-83f8-73ea2d... View Issue

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