feat: terminal sudo blocking, token tracking, mermaid & consumption UI

- Block sudo/doas commands when not running as root
- Add real token counting from API responses
- Track and display consumption by provider/day
- Add Mermaid diagram rendering in Shell and Studio
- Add copy-to-clipboard buttons for code blocks
- Support tables in AI message rendering
- Update system prompt with context (date, time, root status)

💘 Generated with Crush

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

internal/agent/definitions.go

@@ -3,6 +3,7 @@ package agent
 import (
 	"context"
 	"fmt"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
@@ -14,6 +15,13 @@ type TerminalParams struct {
 	Timeout int    `json:"timeout,omitempty" description:"Timeout in seconds (default 60, max 300)"`
 }
 
+type TerminalResponse struct {
+	Content     string `json:"content"`
+	IsError     bool   `json:"is_error"`
+	SudoBlocked bool   `json:"sudo_blocked,omitempty"`
+	Command     string `json:"command,omitempty"`
+}
+
 func NewTerminalTool() (*ToolDefinition, error) {
 	return NewTool("terminal",
 		"Execute a shell command on the local system and return the output. Use for running builds, tests, git operations, package management, system info, or any CLI task. Commands run in the user's home directory by default. Long-running commands are auto-terminated.",
@@ -22,6 +30,18 @@ func NewTerminalTool() (*ToolDefinition, error) {
 				return TextErrorResponse("command is required"), nil
 			}
 
+			if os.Geteuid() != 0 {
+				trimmed := strings.TrimSpace(p.Command)
+				lower := strings.ToLower(trimmed)
+				if strings.HasPrefix(lower, "sudo ") || strings.HasPrefix(lower, "doas ") || strings.HasPrefix(lower, "run0 ") || strings.HasPrefix(lower, "pkexec ") {
+					return ToolResponse{
+						Content: fmt.Sprintf("BLOCKED: Command '%s' requires elevated privileges (%s). The current user is not root. Do NOT retry with sudo. Explain to the user that this command needs admin privileges and suggest an alternative, or tell them to run it manually in their terminal.", trimmed, strings.Fields(trimmed)[0]),
+						IsError: true,
+						Meta:    map[string]string{"sudo_blocked": "true", "command": trimmed},
+					}, nil
+				}
+			}
+
 			timeout := time.Duration(p.Timeout) * time.Second
 			if timeout == 0 {
 				timeout = 60 * time.Second