Add useFilenamingConvention rule to Biome config

[devin-ai-integration]

Issue

• Requested by @MH4GF in Slack to configure useFilenamingConvention rule and measure lint error count

Why is this change needed?

This change adds the Biome useFilenamingConvention linting rule to enforce consistent filename casing conventions across the codebase. The rule is configured to accept camelCase, PascalCase, or filenames that match export names.

Changes

• Added useFilenamingConvention rule to shared Biome configuration
• Rule configured with filenameCases: ["camelCase", "PascalCase", "export"]
• Set to "error" level to enforce the convention

Impact

This rule generates 7 lint errors across 4 packages:

• @liam-hq/app: 3 errors (global-error.tsx, instrumentation-client.ts, install-prisma-internals.mjs)
• @liam-hq/docs: 2 errors (global-error.tsx, instrumentation-client.ts)
• @liam-hq/cli: 1 error (vite-env.d.ts)
• @liam-hq/pglite-server: 1 error (PGliteInstanceManager.test.ts)

⚠️ Important: Per the original request, these lint errors are intentionally left unfixed to measure the impact. The frontend-lint CI check will fail until these files are renamed.

Review Checklist

• Verify the Biome rule configuration syntax is correct
• Confirm that leaving lint errors unfixed is intentional per requirements
• Check that the rule is placed appropriately in the config structure
• Consider impact on development workflow with failing CI

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Link to Devin run: https://app.devin.ai/sessions/720510d65dce464ca7aa5f3f0ffdfb95
Requested by: @MH4GF

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Updates to Preview Branch (devin/1758712860-add-filename-convention-rule) ↗︎

Deployments	Status	Updated
Database	✅	Wed, 24 Sep 2025 11:25:44 UTC
Services	✅	Wed, 24 Sep 2025 11:25:44 UTC
APIs	✅	Wed, 24 Sep 2025 11:25:44 UTC

Tasks are run on every commit but only new migration files are pushed.
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Tasks	Status	Updated
Configurations	✅	Wed, 24 Sep 2025 11:25:49 UTC
Migrations	✅	Wed, 24 Sep 2025 11:25:51 UTC
Seeding	✅	Wed, 24 Sep 2025 11:25:55 UTC
Edge Functions	✅	Wed, 24 Sep 2025 11:25:55 UTC

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