fix(#701): turn off telemetry by default on self-hosted instances

[rbalogic]

Summary

• Defaulted telemetry (data_collection) to off for self-hosted/OIDC deployments.
• Kept existing default behavior for consumer/cloud deployments.
• Centralized the default logic in a helper so all fallback paths stay consistent.
• Updated telemetry-related fallbacks to use that shared helper instead of hardcoded true.
• Added focused unit coverage for the mode-based default behavior.

Why?

Self-hosted deployments should be privacy-first by default. This aligns runtime behavior with the intended deployment mode semantics (VITE_AUTH_MODE=oidc).

Changes

• src/defaults/settings.ts
  • Added getDefaultDataCollectionValue(authMode?: string)
  • Updated default data_collection setting to use that helper.
• src/lib/posthog.tsx
  • Updated getSettings fallback for data_collection to use the helper.
• src/settings/preferences.tsx
  • Updated useSettings fallback for data_collection to use the helper.
• src/defaults/settings.test.ts
  • Added tests covering:
    • oidc -> false
    • consumer -> true
    • undefined mode -> true

Test Plan

• Verified logic paths in code:
  • OIDC/self-hosted defaults telemetry to off.
  • Consumer/default mode remains on.
• Added unit tests for default selection helper.
• Run locally (if needed):
  • bun test src/defaults/settings.test.ts
  • bun test src/lib/posthog.test.ts
  • make format
  • bun run check

Related

• Closes Turn off Telemetry by default on self-hosted instances #701

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Note

Medium Risk
Changes the default telemetry opt-in behavior based on VITE_AUTH_MODE, which can affect analytics initialization and user-visible defaults across deployments. Low implementation complexity, but sensitive due to privacy/telemetry semantics.

Overview
Telemetry (data_collection) is now disabled by default when running in oidc (self-hosted/enterprise) mode, while remaining enabled by default for consumer/unspecified modes.

This centralizes the mode-based default in getDefaultDataCollectionValue() and updates all fallback/default paths (default settings seed, PostHog initialization, and Preferences settings hook) to use it, with a small unit test added to lock in the behavior.

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