feat(auth): support the __override view-as login (insight#1941)

[cyberantonz]

Summary

Companion to constructorfabric/insight#1944 (authenticator __override view-as, restoring constructorfabric/insight#1941).

• Historical URL keeps working: ?__override=<email> on any page is consumed at boot (src/auth/override.ts, wired in main.tsx before mocks/session/router) and bounced into /auth/login?__override=...&return_to=<page without the param>. Works while already logged in — the authenticator's session-fixation guard revokes the presented session at the callback and the IdP hop is silent SSO.
• Session store: /auth/me's impersonator_email (present only on view-as sessions) is parsed into Session.impersonatorEmail.
• "Viewing as X" banner (view-as-banner.tsx, next to the mock banner in the root layout): names the effective person and the real principal, with an Exit view-as button that simply re-logs-in as yourself.

Server-side the override is honored only where the authenticator's override_enabled flag is on (dev/demo stands); everywhere else the parameter is inert and this UI never renders.

Testing

• npm test: 686 passed (new: override.test.ts bounce + no-op, session.test.ts impersonator parsing).
• npm run typecheck + npm run build clean.
• npm run lint: the 3 pre-existing problems in eslint-plugin-local/dist are unchanged (present on clean main); no new findings.

⚠️ Merge after (or together with) the backend PR — without it the banner never shows and __override is a harmless no-op.

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⚙️ Run configuration

Configuration used: defaults

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Run ID: e13a1c33-f78e-4368-a417-893947d057d2

📥 Commits

Reviewing files that changed from the base of the PR and between 7e7d63f and 7a9db43.

📒 Files selected for processing (11)

• src/auth/index.ts
• src/auth/override.test.ts
• src/auth/override.ts
• src/auth/session.test.ts
• src/auth/session.ts
• src/auth/types.ts
• src/components/view-as-banner.tsx
• src/locales/en/translation.json
• src/main.tsx
• src/routes/__root.tsx
• src/test/session.ts

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