fix(apps): align app name limit to 64 chars

[rohan-chaturvedi]

🔍 Overview

App name limits were inconsistent:

Where	Before
Console create app dialog	32 (shared MAX_INPUT_STRING_LENGTH)
Console app settings rename	64
App.name column	64
REST POST /v1/apps/, PUT /v1/apps/<id>/	64
GraphQL updateAppInfo	64
GraphQL createApp	no check
Public API docs	64

createApp accepted blank names, and names over 64 chars failed at the database instead of returning a clear error.

💡 Proposed Changes

• Console: new MAX_APP_NAME_LENGTH = 64, used by the create dialog and the settings rename input. MAX_INPUT_STRING_LENGTH (32) is unchanged for its other uses (team name in onboarding).
• createApp: reject blank names and names over 64 chars, with the same checks and messages as updateAppInfo.

No REST API, model or docs changes: they already use 64.

🖼️ Screenshots or Demo

N/A

📝 Release Notes

• App names can now be up to 64 characters when creating an app in the console, matching rename and the API.
• Creating an app with a blank name or a name over 64 characters now returns a clear error.

❓ Open Questions

N/A

🧪 Testing

• New backend/tests/graphene/mutations/test_app.py: blank and whitespace names rejected, 65 chars rejected, 64 chars accepted. The rejection tests fail without the fix.
• Backend: pytest tests/ passes except tests/utils/test_secret.py::test_file_read_permission_error, which also fails on main when run as root (chmod 000 does not block root). Unrelated.
• Frontend: yarn test (459 passed), eslint, prettier and tsc --noEmit clean.

🎯 Reviewer Focus

backend/backend/graphene/mutations/app.py (CreateAppMutation.mutate).

➕ Additional Context

N/A

✨ How to Test the Changes Locally

1. Open the create app dialog and enter a name longer than 32 characters. It now accepts up to 64.
2. Send createApp with a blank name or a name over 64 chars. It returns a GraphQL error and no app is created.

💚 Did You...

• Ensure linting passes (code style checks)?
• Update dependencies and lockfiles (if required) — N/A
• Update migrations (if required) — N/A
• Regenerate graphql schema and types (if required) — N/A, schema unchanged
• Verify the app builds locally? (tsc --noEmit)
• Manually test the changes on different browsers/devices? — not done

🤖 Generated with Claude Code

https://claude.ai/code/session_01VZnEgPhtLy7nNZvyxispob

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