Apply consistent Rich formatting across all CLI commands

Standardize color usage to match TinyTorch CLI style guide:
- Replace [blue] with [cyan] for all action/info messages (10 instances)
- Replace [bold blue] with [bold cyan] for headers (1 instance)
- Replace "bold blue" with "bold cyan" for table headers (3 instances)
- Replace "bright_blue" with "bright_cyan" for panel borders (1 instance)

Files updated:
- tito/main.py: Welcome screen community commands now use [cyan]
- tito/commands/login.py: URL display now uses [cyan]
- tito/commands/protect.py: All 7 blue instances → cyan
- tito/commands/milestone.py: Table headers → bold cyan
- tito/commands/test.py: Table headers → bold cyan
- tito/commands/grade.py: Border style → bright_cyan

Result: Holistic CLI consistency with [cyan] for actions, [green] for success,
[yellow] for warnings, [red] for errors across all 15+ commands.

tito/commands/grade.py

@@ -182,7 +182,7 @@ class GradeCommand(BaseCommand):
             "  9. tito grade export             # Export grades\n\n"
             "[dim]Note: NBGrader must be installed and configured[/dim]",
             title="Grade Help",
-            border_style="bright_blue"
+            border_style="bright_cyan"
         )
         self.console.print(help_panel)
     

tito/commands/login.py

@@ -38,7 +38,7 @@ class LoginCommand(BaseCommand):
         try:
             port = receiver.start()
             target_url = f"{ENDPOINTS['cli_login']}?redirect_port={port}"
-            self.console.print(f"Opening browser to: [blue]{target_url}[/blue]")
+            self.console.print(f"Opening browser to: [cyan]{target_url}[/cyan]")
             self.console.print("Waiting for authentication...")
             webbrowser.open(target_url)
             tokens = receiver.wait_for_tokens()

tito/commands/protect.py

@@ -89,7 +89,7 @@ class ProtectCommand(BaseCommand):
         
         # Show header
         console.print(Panel.fit(
-            "🛡️ [bold blue]TinyTorch Student Protection System[/bold blue]\n"
+            "🛡️ [bold cyan]TinyTorch Student Protection System[/bold cyan]\n"
             "Prevents accidental edits to critical core functionality",
             border_style="blue"
         ))
@@ -112,7 +112,7 @@ class ProtectCommand(BaseCommand):
     
     def _enable_protection(self, console: Console, args: Namespace) -> int:
         """🔒 Enable comprehensive protection system."""
-        console.print("[blue]🔒 Enabling TinyTorch Student Protection System...[/blue]")
+        console.print("[cyan]🔒 Enabling TinyTorch Student Protection System...[/blue]")
         console.print()
         
         protection_count = 0
@@ -221,7 +221,7 @@ echo "✅ No auto-generated files being committed"
             "📝 GitHub will label files as 'Generated'\n"
             "🚫 Git prevents committing generated files\n"
             "⚙️  VSCode shows protection warnings\n\n"
-            "[blue]Students are now protected from breaking CIFAR-10 training![/blue]",
+            "[cyan]Students are now protected from breaking CIFAR-10 training![/blue]",
             border_style="green"
         ))
         
@@ -262,10 +262,10 @@ echo "✅ No auto-generated files being committed"
     
     def _show_protection_status(self, console: Console) -> int:
         """🔍 Show current protection status."""
-        console.print("[blue]🔍 TinyTorch Protection Status[/blue]")
+        console.print("[cyan]🔍 TinyTorch Protection Status[/blue]")
         console.print()
         
-        table = Table(show_header=True, header_style="bold blue")
+        table = Table(show_header=True, header_style="bold cyan")
         table.add_column("Protection Feature", style="cyan")
         table.add_column("Status", justify="center")
         table.add_column("Details", style="dim")
@@ -335,7 +335,7 @@ echo "✅ No auto-generated files being committed"
         """✅ Validate core functionality works correctly."""
         try:
             from tinytorch.core._validation import run_student_protection_checks
-            console.print("[blue]🔍 Running comprehensive validation...[/blue]")
+            console.print("[cyan]🔍 Running comprehensive validation...[/blue]")
             console.print()
             
             try:
@@ -358,7 +358,7 @@ echo "✅ No auto-generated files being committed"
     
     def _quick_health_check(self, console: Console) -> int:
         """⚡ Quick health check of critical functionality."""
-        console.print("[blue]⚡ Quick Health Check[/blue]")
+        console.print("[cyan]⚡ Quick Health Check[/blue]")
         console.print()
         
         checks = []

tito/commands/test.py

@@ -560,7 +560,7 @@ class TestCommand(BaseCommand):
         console = self.console
         
         # Summary table
-        table = Table(title="Test Summary Report", show_header=True, header_style="bold blue")
+        table = Table(title="Test Summary Report", show_header=True, header_style="bold cyan")
         table.add_column("Module", style="bold cyan", width=15)
         table.add_column("Status", width=10, justify="center")
         table.add_column("Inline Tests", width=12, justify="center")

tito/main.py

@@ -202,8 +202,8 @@ Quick Start:
                 help_text += "  [yellow]tito module status[/yellow]        View module progress\n"
                 help_text += "  [yellow]tito milestones status[/yellow]    View unlocked capabilities\n"
                 help_text += "\n[bold cyan]Community:[/bold cyan]\n"
-                help_text += "  [blue]tito community login[/blue]         Log in to TinyTorch\n"
-                help_text += "  [blue]tito community leaderboard[/blue]   View global leaderboard\n"
+                help_text += "  [cyan]tito community login[/cyan]         Log in to TinyTorch\n"
+                help_text += "  [cyan]tito community leaderboard[/cyan]   View global leaderboard\n"
                 help_text += "\n[bold cyan]Help & Docs:[/bold cyan]\n"
                 help_text += "  [magenta]tito system doctor[/magenta]       Check environment health\n"
                 help_text += "  [magenta]tito --help[/magenta]              See all commands"