Fix: "Back to community" button navigation in Lite proposal details

[ashutoshpw]

Problem

The "Back to community" button in Lite proposal details was always navigating to the Lite DAO view, even when users accessed the proposal from a V3 DAO's Off-Chain proposals tab. This created a confusing user experience where clicking the back button would take users to a different DAO interface than they started from.

Navigation flow before fix:

V3 DAO (/explorer/dao/{daoId}) 
  → Click Off-Chain Proposal 
  → Lite Proposal Details
  → Click "Back to community"
  → ❌ Always redirects to Lite DAO view (/explorer/lite/dao/{id}/community)

Solution

This PR fixes the navigation by passing context about the originating DAO through React Router's location state. When a user navigates to a lite proposal from a V3 DAO, we now track the V3 DAO's ID and use it to navigate back to the correct view.

Navigation flow after fix:

V3 DAO → Off-Chain Proposal → Click "Back to community" → ✅ Returns to V3 DAO
Lite DAO → Proposal → Click "Back to community" → ✅ Returns to Lite DAO

Fixes #916

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