Fix Grant All checkbox not showing indeterminate state in permission modal

[maliming]

Summary

• Fixed the "Grant All Permissions" checkbox not displaying indeterminate state when only some permission groups are fully selected
• Changed GrantAll and GrantAny calculation to use _allGroups instead of _groups (filtered list)
• Affected methods: GroupGrantAllChanged, PermissionChanged, and OnPermissionGroupSearchTextChangedAsync

Problem

When selecting "Select All" for a specific permission group in the Blazor permission modal, the top-level "Grant All Permissions" checkbox appeared as if all permissions were granted, instead of showing the indeterminate ("-") state.

Root Cause

The GrantAll and GrantAny properties were calculated based on _groups (the filtered/visible list) instead of _allGroups (all permission groups). This caused incorrect state when:

• Groups were filtered via search
• Only some groups had all permissions selected

Test plan

• Open permission management modal with multiple permission groups
• Click "Select All in This Tab" for one group only
• Verify the top "Grant All Permissions" checkbox shows indeterminate state (-)
• Filter groups using search, then select all in a filtered group
• Verify the top checkbox still shows correct indeterminate state

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR fixes a bug in the Blazor permission management modal where the "Grant All Permissions" checkbox did not correctly display an indeterminate state when only some permission groups had all their permissions selected.

Changes:

• Changed GrantAll and GrantAny property calculations to use _allGroups (all permission groups) instead of _groups (filtered/visible groups) in three methods
• Fixed the checkbox state calculation to reflect the actual state of all permissions, not just the filtered/visible ones