Add useFilenamingConvention rule with camelCase and PascalCase

[devin-ai-integration]

Issue

• This change was requested in Slack to add the useFilenamingConvention rule to see how many filename convention errors exist in the codebase
• Link to Devin run: https://app.devin.ai/sessions/488c48c373cc4ac39f3c7a792a455b33
• Requested by: [email protected] (@MH4GF)

Why is this change needed?

The team wants to assess the current state of filename conventions across the codebase by adding Biome's useFilenamingConvention rule configured for camelCase and PascalCase. This will help identify files that don't follow the desired naming conventions.

Changes Made

• Added useFilenamingConvention rule to the shared Biome configuration (frontend/internal-packages/configs/biome.jsonc)
• Configured the rule to enforce camelCase and PascalCase filename conventions
• Set the rule level to error to make violations visible in lint output

Current Impact

Based on initial testing, the rule found 1 filename convention violation:

• src/logos/XLogo.tsx in the @liam-hq/ui package (should be xLogo.tsx)

Review Checklist

⚠️ Important considerations for review:

1. CI Impact: Verify this change won't break CI builds - the rule introduces new lint errors
2. Rule Configuration: Confirm the Biome rule syntax and filenameCases options are correct
3. Scope Assessment: The shared config affects all packages - there may be more violations than initially detected
4. Alignment: Verify this matches the original request (assessment only, no fixes applied)

Note

As requested, lint errors are intentionally not fixed - this PR is solely for adding the rule to assess the current state of filename conventions in the codebase.

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