feat: Cross-Subscription Search & Performance Improvements

[nikolaifa]

FYI, everything is vibed

Main Goals

1. Cross-Subscription Global Search (G key)

   • Search for resources across ALL subscriptions simultaneously using Azure Resource Graph
   • Display results with full context: name (subscription / resource-group / Type)

2. Subscription-Level Resource Viewing (A key)

   • View all resources in a subscription without selecting a specific resource group first
   • Uses Azure Resource Graph for efficient cross-RG queries within a subscription

3. Resource Type Filtering (T key)

   • Filter resources by type using a modal picker with fuzzy search
   • Type filter persists across global search and subscription view modes
   • Server-side filtering via Resource Graph for optimal performance

4. Faster Startup for Unauthenticated Users
   ❌

New Dependencies

• github.com/Azure/azure-sdk-for-go/sdk/azcore/arm - ARM client utilities
• github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resourcegraph/armresourcegraph - Resource Graph queries

New Keybindings

Key	Context	Action
G	Subscriptions	Start cross-subscription global search
A	Subscriptions	View all resources in selected subscription
T	Subscriptions/Resources	Open type filter picker