supabase / supabase / 21763691875

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feat(telemetry): add dev telemetry toolbar (#42259)

## Problem
We need a local-only UI to inspect client and server telemetry events
and override flags during development without touching non-local env
behavior. This work is intended to be shared across Studio, Docs, and
WWW.

## Changes
- Introduced a shared `dev-tools` package with the Dev Telemetry Toolbar
UI, trigger, and provider.
- Wired the toolbar into Studio, Docs, and WWW app shells (local-only
gating).
- Added a local-only `devTelemetry()` opt-in with storage gating and SSE
subscription.
- Wired client PostHog events into a local listener and re-exported
types.
- Added local flag override cookie support in the UI and CODEOWNERS for
the new package.
- Added unit tests covering local/non-local behavior and flag utilities.

## Testing
Manual (local only):
- Start each app locally: `pnpm dev:studio`, `pnpm dev:docs`, `pnpm
dev:www`
- Open the app, run `devTelemetry()` in the browser console
- Click around and confirm both client and server events appear (client
will be page views only)
- Verify feature flag overrides (PostHog + ConfigCat) persist and
restore correctly
- Confirm dismissing the toolbar clears local storage and hides the
trigger

Unblocked by https://github.com/supabase/platform/pull/29172

Resolves GROWTH-591

Demo:

[github.com/user-attachments/assets/60b376db-7440-4ada-82f5-d1bd4af4db3b](https://github.com/user-attachments/assets/60b376db-7440-4ada-82f5-d1bd4af4db3b)

Screenshots:

<img width="1368" height="972" alt="1"
src="https://github.com/user-attachments/assets/d2f20a0c-191f-4118-bb5e-15b25f5a54a9"
/>

<img width="1423" height="790" alt="2"
src="https://github.com/user-attachments/assets/115598e2-7287-49bf-9ed7-71ecc679dee3"
/>

<img width="1433" height="882" alt="3"
src="https://github.com/user-attachments/assets/51f666f2-9efc-410f-baec-378bdee9dbfe"
/>

<img width="608" height="483" alt="4"
src="https://github.com/user-attachments/assets/584d6cf5-1b2f-4cee-9e6a-d55ce2e... (continued)

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