Statusline setup breaks Alacritty config when keyboard.bindings uses inline array syntax

Bug

Claude Code's statusline setup appends a [[keyboard.bindings]] block to ~/.config/alacritty/alacritty.toml to configure Shift+Enter for multiline input. However, if keyboard.bindings is already defined using TOML inline array syntax, this causes a parse error because TOML doesn't allow mixing inline array syntax with array-of-tables syntax for the same key.

Steps to reproduce

1. Have an existing Alacritty config with inline array bindings:

[keyboard]
bindings = [
{ key = "Insert", mods = "Shift", action = "Paste" },
{ key = "Insert", mods = "Control", action = "Copy" }
]

1. Let Claude Code's statusline setup append its Shift+Enter binding

1. The config becomes:

[keyboard]
bindings = [
{ key = "Insert", mods = "Shift", action = "Paste" },
{ key = "Insert", mods = "Control", action = "Copy" }
]

[[keyboard.bindings]]
key = "Return"
mods = "Shift"
chars = "\^[\r"

1. Alacritty fails to load with:

Config error: TOML parse error at line 26, column 12
duplicate key

Expected behavior

The statusline setup should detect the existing keyboard.bindings format and either:

• Append the new binding into the existing inline array, or
• Convert to a consistent format before adding

Environment

• Alacritty on Linux (Arch)
• Claude Code CLI