fix(lint): resolve go-critic findings

[elliottophellia]

Summary

Resolve all 12 findings reported by go-critic check ./... without changing the intended behavior.

Changes

• Make append targets explicit in setup model ordering and CDP event buffering.
• Replace flagged if-else chains with condition switches.
• Split OSINT email addresses safely using strings.Cut.
• Normalize modal width and height parameter names.

Validation

• go test ./...
• go vet ./...
• go-critic check ./...