refactor: use drop-ins for aliases and path management

installers/install_uv.sh

@@ -87,25 +87,15 @@ configure_shell() {
     # Add ~/.local/bin to PATH for the current process
     export PATH="$HOME/.local/bin:$PATH"
 
+    # Clean up legacy in-place configuration blocks
     IFS=' ' read -ra target_files <<< "$(get_shell_configs)"
-
     for config_file in "${target_files[@]}"; do
-        # Ensure ~/.local/bin is in PATH for this file if not already present
-        if ! grep -q '\.local/bin' "$config_file" 2>/dev/null; then
-            log_info "Adding ~/.local/bin to PATH in $config_file..."
-            local path_content='export PATH="$HOME/.local/bin:$PATH"'
-            inject_block "$config_file" "local-bin path" "$path_content"
-        fi
-
-        log_info "Adding uv completion to $config_file..."
-        local content='eval "$(uv generate-shell-completion bash)"'
-        inject_block "$config_file" "uv completion" "$content"
-
-        # Source to apply changes in the current context
-        if [ "$config_file" = "$HOME/.bashrc" ]; then
-            . "$config_file" 2>/dev/null || true
-        fi
+        remove_block "$config_file" "local-bin path"
+        remove_block "$config_file" "uv completion"
     done
+
+    write_env_snippet "local-bin" 'export PATH="$HOME/.local/bin:$PATH"'
+    write_env_snippet "uv" 'eval "$(uv generate-shell-completion bash)"'
 }
 
 main() {