chore: Inline the switch user UX

[luke-belton]

Problem

Switching user is something I've needed so infrequently, it doesn't make sense to make it one of the primary actions on the impersonation notice.

Changes

Inline the switch user menu with the currently impersonated user's email.

CleanShot.2026-07-16.at.09.16.34.mp4

How did you test this code?

Verified locally

[github-actions]

🦔 Hogbox preview · ✅ ready

▶ Open the preview

🔑 Login	test@posthog.com / 12345678 (demo data)
🧩 Running	this PR's backend and frontend, on the PostHog :master base
🔗 Link	stable across rebuilds — a re-push swaps the box underneath, the URL stays
🔒 Access	tailnet only (PostHog VPN)
🛠️ Admin	inspect & debug state in hogland
💤 Idle	sleeps after ~30 min idle (snapshot to S3, zero node cost) and wakes on your next visit in ~30s, behind a brief "waking up" screen

_{commit a1b7274 · box box-55d385108d16 · ready in 747s (push → usable) · build log · rebuilds on every push, torn down on close}

[greptile-apps]

_{Reviews (1): Last reviewed commit: "inline the switch user UX" | Re-trigger Greptile}

[github-actions]

🤖 CI report

⚠️ Bundle size — 🔺 +473 B (+0.0%)

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 64.77 MiB · 🔺 +473 B (+0.0%)

No file changed by more than 1000 B.

_{Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report}

✅ Eager graph — within budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root	Eager (shipped)	Δ vs base	Budget
entry (logged-out pages, app bootstrap) src/index.tsx	1.22 MiB · 22 files	🔺 +245 B (+0.0%)	███░░░░░░░ 28.4% of 4.29 MiB
authenticated shell (every logged-in page) src/scenes/AuthenticatedShell.tsx	8.13 MiB · 2,978 files	🔺 +331 B (+0.0%)	█████████░ 87.9% of 9.25 MiB

🟢 node_modules/monaco-editor/ stays out of src/index.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 [object Object] stays out of src/index.tsx
🟢 node_modules/monaco-editor/ stays out of src/scenes/AuthenticatedShell.tsx
🟢 src/lib/components/ActivityLog/describers stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx
🟢 [object Object] stays out of src/scenes/AuthenticatedShell.tsx

Largest files eagerly shipped from src/index.tsx

Size	File
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
24.6 KiB	../node_modules/.pnpm/buffer@6.0.3/node_modules/buffer/index.js
6.3 KiB	../node_modules/.pnpm/react@18.3.1/node_modules/react/cjs/react.production.min.js
4.5 KiB	../node_modules/.pnpm/@jspm+core@2.1.0/node_modules/@jspm/core/nodelibs/browser/process.js
3.9 KiB	../node_modules/.pnpm/scheduler@0.23.2/node_modules/scheduler/cjs/scheduler.production.min.js
1.4 KiB	../node_modules/.pnpm/base64-js@1.5.1/node_modules/base64-js/index.js
1.3 KiB	src/RootErrorBoundary.tsx
912 B	../node_modules/.pnpm/ieee754@1.2.1/node_modules/ieee754/index.js
789 B	src/scenes/ChunkLoadErrorBoundary.tsx
762 B	src/index.tsx

Largest files eagerly shipped from src/scenes/AuthenticatedShell.tsx

Size	File
281.3 KiB	../node_modules/.pnpm/posthog-js@1.402.3/node_modules/posthog-js/dist/rrweb.js
267.7 KiB	../node_modules/.pnpm/@posthog+icons@0.38.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js
235.5 KiB	src/taxonomy/core-filter-definitions-by-group.json
222.9 KiB	../node_modules/.pnpm/posthog-js@1.402.3/node_modules/posthog-js/dist/module.js
164.0 KiB	src/queries/validators.js
154.3 KiB	../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js
126.8 KiB	../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js
105.8 KiB	src/lib/api.ts
93.3 KiB	../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js
92.7 KiB	../packages/quill/packages/quill/dist/index.js

_{Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of #32479}

✅ Dist folder size — 🔺 +20.6 KiB (+0.0%)

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 1312.70 MiB · 🔺 +20.6 KiB (+0.0%)

✅ Playwright — all passed

All tests passed.

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[xljones]

Nice. I'd love to see the upgrade to r/w button promoted here unless you've other ideas for something else.

[deployment-status-posthog]

Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-07-16 10:05 UTC	Run
prod-us	✅ Deployed	2026-07-16 10:34 UTC	Run
prod-eu	✅ Deployed	2026-07-16 10:20 UTC	Run