fix(admin/policies): Viewer role sees read-only Purchasing Policies

[cristim]

Summary

QA Viewer Role 6.2: Viewer role users could type values into the Admin > Purchasing Policies inputs. Only the Save button rejected with "Failed to save settings: admin access required" -- the UI didn't gate input.

Fix

For non-admin roles:

• Inputs under #purchasing-panel rendered with disabled=true.
• #save-purchasing-btn and #reset-purchasing-btn hidden.
• Dynamically-rendered RI Exchange automation form covered via applyReadOnlySettings(null) at the end of renderAutomationSettings.

Admin role unchanged. Backend remains the authoritative security boundary (still returns 403 on writes).

Files changed

• frontend/src/settings.ts (export + apply applyReadOnlySettings)
• frontend/src/riexchange.ts (re-apply after re-render)
• frontend/src/__tests__/settings-permissions.test.ts

Test plan

• 8 permission tests pass covering admin, readonly, user, and null cases.
• 65 test suites pass (2146 tests + 1 skipped).
• Manual: log in as viewer, open Admin > Purchasing Policies, confirm inputs disabled + Save/Reset hidden.

Closes #870.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f10ce528-2494-4b84-84e1-b63bb5537058

📥 Commits

Reviewing files that changed from the base of the PR and between 4956d66 and c14964e.

📒 Files selected for processing (3)

• frontend/src/__tests__/settings-permissions.test.ts
• frontend/src/riexchange.ts
• frontend/src/settings.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/870-viewer-admin-policies-readonly

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