fix(avatar): handle names with consecutive delimiters

[fortmarek]

Summary

• Fix FunctionClauseError in avatar component when name contains consecutive delimiters

Problem

When a name contains consecutive delimiters (e.g., john--doe or jane__smith), String.split(~r/[\s,_\-]/) produces empty strings in the result list:

String.split("john--doe", ~r/[\s,_\-]/)
# => ["john", "", "doe"]

Then String.first("") returns nil, which causes String.upcase(nil) to fail with:

** (FunctionClauseError) no function clause matching in String.upcase/2

Solution

Filter out empty strings after splitting before processing initials:

@name
|> String.split(~r/[\s,_\-]/)
|> Enum.reject(&(&1 == ""))  # <- added
|> Enum.take(@number_of_initials)
|> Enum.map(&String.first/1)
|> Enum.map(&String.upcase/1)
|> Enum.join()

Test plan

• Tested with names containing consecutive delimiters (e.g., test--user)
• Verified existing avatar functionality still works

🤖 Generated with Claude Code