feat(auth): send X-CSRF-Token on state-changing /auth/* (nginx+auth step 10.5)

[cyberantonz]

SPA side of nginx+auth step 10.5 (CSRF). Pairs with backend PR constructorfabric/insight#1848, which now enforces CSRF fail-closed on state-changing /auth/*.

• Session gains csrfToken, populated from GET /auth/me (csrf_token).
• signOut sends X-CSRF-Token on POST /auth/logout.

Any future SPA-initiated state-changing /auth/* call (e.g. an explicit refresh) must send the same header.

⚠️ Merge coordination: land this (or set the backend's csrfOrigins to the SPA origin) before/with the backend chart roll, or logout 403s during the transition.

Unit tests updated (src/auth/*). Pre-existing unrelated test-collection + eslint-plugin failures on main are untouched.

EPIC: constructorfabric/insight#1583 · #1593

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Reviewing files that changed from the base of the PR and between 79b3ed7 and 56082a5.

📒 Files selected for processing (5)

• src/auth/session.test.ts
• src/auth/session.ts
• src/auth/types.ts
• src/auth/use-auth.test.ts
• src/auth/use-auth.ts

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