Feature: allow setting a Dashboard as the default landing page (post-login home)

Problem Twenty currently has no way to set a Dashboard as the post-login landing page. The default routing logic in [useDefaultHomePagePath.ts]( only considers object table views: 1. lastVisitedObjectMetadataItemId (client-side Jotai state) → that object's table 2. Else, the alphabetically-first readable non-system object (typically "Companies") Dashboards are not considered, even though Twenty's Dashboard primitive (with multi-tab support + RECORD_TABLE / chart widgets) is exactly the surface most CRM users want as their home. Use case (concrete) We're a self-hosted Twenty workspace running EOS (Entrepreneurial Operating System). Our Today dashboard contains four tabs: • Tab 1 — Rocks (current quarter) • Tab 2 — Tasks (assigned to me) • Tab 3 — Issues (open IDS items) • Tab 4 — Meetings (recent CouncilSessions) This is the workspace member's daily homepage. We want it to be where users land after sign-in or when explicitly …