feat: /dashboard/profile page for NGO users

[nadavosa]

Summary

• Creates src/app/[lang]/dashboard/profile/page.tsx — the missing route that caused a 404 when NGO users clicked Profile in the sidebar
• Fixes useGetCurrentAgent to derive agentId from GET /user/me (which returns agentId since feat: include agentId in GET /user/me response be#692) instead of the non-existent GET /agent/me; then fetches the full agent via GET /agent/:id
• Page shows a loading message while resolving, a "not set up" message if no agentId, and AgentProfileController when the agent is found — consistent with how /dashboard/agents/:id works
• Also fixes useGetCurrentAgent for NewOpportunity, which previously couldn't pre-fill contact details because GET /agent/me never existed

Closes #677

Test plan

• NGO user clicks Profile in sidebar → profile page loads with their agent profile
• User with no agent linked → "not set up" message shown
• Loading state shown briefly while fetching
• New opportunity form pre-fills contact name/phone/email from agent representative

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