[tui] Build organization context provider for nested org screens #193
Description
Build organization context provider for nested org screens
Type: engineering
Domain: Codeplane TUI
Create an OrgContextProvider that wraps organization sub-screens (Overview, Members, Teams, Team Detail, Settings) and provides shared state: org name, org data, viewer role (owner/member), and org-level error handling. The provider fetches org data via useOrg() on mount and makes it available via useOrgContext() hook. It handles 404 (org not found), 403→404 concealment for non-members of non-public orgs, and caches org data for child screens. Implementation in apps/tui/src/providers/OrgContextProvider.tsx.
Dependencies: tui-org-data-hooks
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