fix(admin): surface API error message in assign role toast

[paanSinghCoder]

The Assign Role dialog catch blocks were swallowing the server's error and showing only a generic "Failed to assign role" toast. The actual reason (e.g. `last member cannot change role`) was never visible to the user.

Forwards `ConnectError.rawMessage` into the toast `description` field for both the org-level and project-level Assign Role dialogs. Falls back to no description for non-`ConnectError` errors → toast behavior is unchanged for those.

Affected paths:

• web/sdk/admin/components/AssignRole.tsx
  paths:

  1. /workspaces/{orgId}/members → row action menu on a member → "Assign role…"
  2. /users/{userId} → side panel → membership row → role dropdown → "Assign role…"

• web/sdk/admin/views/organizations/details/projects/members/assign-role.tsx
  Paths:

  1. /workspaces/{orgId}/projects → click a project row (opens the Project Members dialog) → row action menu on a member → "Assign role…"

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 3cdd0bef-1780-42d0-a437-3b977e1a73bb

📥 Commits

Reviewing files that changed from the base of the PR and between a9f2e87 and bcea3d4.

📒 Files selected for processing (2)

• web/sdk/admin/components/AssignRole.tsx
• web/sdk/admin/views/organizations/details/projects/members/assign-role.tsx

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Enhanced error messaging for role assignment failures to display detailed error information instead of generic messages, providing better visibility into what went wrong.

Walkthrough

Two role-assignment files are updated to enhance error reporting: AssignRole.tsx and assign-role.tsx both import ConnectError and replace generic error toasts with structured messages that include error.rawMessage when the error is a ConnectError, while success toasts remain unchanged.

Changes

Enhanced error toast messaging on role assignment

Layer / File(s)	Summary
Enhanced error toast in AssignRole component web/sdk/admin/components/AssignRole.tsx	ConnectError is imported and the role-assignment failure toast is updated to include a description field populated from error.rawMessage when a ConnectError is caught.
Enhanced error toast in assign-role view web/sdk/admin/views/organizations/details/projects/members/assign-role.tsx	ConnectError is imported and the failure toast in onSubmit is replaced with a structured toast containing a title and optional description derived from error.rawMessage; the success toast remains unchanged.

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🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coveralls]

Coverage Report for CI Build 26273828643

Coverage remained the same at 42.592%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	37953
Covered Lines:	16165
Line Coverage:	42.59%
Coverage Strength:	11.91 hits per line

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💛 - Coveralls