[codex] show devtools only in dev and move trigger bottom-left

[phenix3443]

Summary

• show TanStack Devtools only in Vite dev mode for admin and user apps
• move the devtools trigger to the bottom-left so it no longer blocks bottom-right actions
• document the default dual-PR workflow for origin and upstream remotes

Why

• the default TanStack floating trigger was appearing in non-dev contexts and overlapping action buttons
• this repo now has an explicit standing rule to open both origin and upstream PRs when submission is requested

Validation

• code inspection only
• unable to run workspace checks in this environment because bun is not installed

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[web-ppanel]

Triage review (automated): This PR looks good. CI checks pass. Changes are scoped to frontend dev tooling — limiting TanStack Devtools visibility to dev mode and repositioning the trigger button to avoid UI conflicts. Ready for maintainer merge review.

[web-ppanel]

Thanks for this PR! The changes to show TanStack DevTools only in dev mode and move the trigger to bottom-left are a good UX improvement. The PR is ready for maintainer review and merge when the team is ready.

[web-ppanel]

Thanks for this improvement! The changes look reasonable — restricting TanStack Devtools to dev mode only is a solid practice, and moving the trigger to bottom-left avoids UI conflicts.

This is a frontend-only change with clear rationale. Keeping open for maintainer review and merge.