feat: Server Color Coding System (#103)

* feat: implement server color coding feature

- Add color column to servers table with migration
- Add SERVER_COLOR_CODING_ENABLED environment variable
- Create API route for color coding toggle settings
- Add color field to Server and CreateServerData types
- Update database CRUD operations to handle color field
- Update server API routes to handle color field
- Create colorUtils.ts with contrast calculation function
- Add color coding toggle to GeneralSettingsModal
- Add color picker to ServerForm component (only shown when enabled)
- Apply colors to InstalledScriptsTab (borders and server column)
- Apply colors to ScriptInstallationCard component
- Apply colors to ServerList component
- Fix 'Local' display issue in installed scripts table

* fix: resolve TypeScript errors in color coding implementation

- Fix unsafe argument type errors in GeneralSettingsModal and ServerForm
- Remove unused import in ServerList component

* feat: add color-coded dropdown for server selection

- Create ColorCodedDropdown component with server color indicators
- Replace HTML select with custom dropdown in ExecutionModeModal
- Add color dots next to server names in dropdown options
- Maintain all existing functionality with improved visual design

* fix: generate new execution ID for each script run

- Change executionId from useState to allow updates
- Generate new execution ID in startScript function for each run
- Fixes issue where scripts couldn't be run multiple times without page reload
- Resolves 'Script execution already running' error on subsequent runs

* fix: improve whiptail handling and execution ID generation

- Remove premature terminal clearing for whiptail sessions
- Let whiptail handle its own display without interference
- Generate new execution ID for both initial and manual script runs
- Fix whiptail session state management
- Should resolve blank screen and script restart issues

* fix: revert problematic whiptail changes that broke terminal display

- Remove complex whiptail session handling that caused blank screen
- Simplify output handling to just write data directly to terminal
- Keep execution ID generation fix for multiple script runs
- Remove unused inWhiptailSession state variable
- Terminal should now display output normally again

* fix: remove remaining inWhiptailSession reference

- Remove inWhiptailSession from useEffect dependency array
- Fixes ReferenceError: inWhiptailSession is not defined
- Terminal should now work without JavaScript errors

* debug: add console logging to terminal message handling

- Add debug logs to see what messages are being received
- Help diagnose why terminal shows blank screen
- Will remove debug logs once issue is identified

* fix: prevent WebSocket reconnection loop

- Remove executionId from useEffect dependency arrays
- Fixes terminal constantly reconnecting and showing blank screen
- WebSocket now maintains stable connection during script execution
- Removes debug console logs

* fix: prevent WebSocket reconnection on second script run

- Remove handleMessage from useEffect dependency array
- Fixes loop of START messages and connection blinking on subsequent runs
- WebSocket connection now stable for multiple script executions
- handleMessage recreation no longer triggers WebSocket reconnection

* debug: add logging to identify WebSocket reconnection cause

- Add console logs to useEffect and startScript
- Track what dependencies are changing
- Identify why WebSocket reconnects on second run

* fix: remove isRunning from WebSocket useEffect dependencies

- isRunning state change was causing WebSocket reconnection loop
- Each script start changed isRunning from false to true
- This triggered useEffect to reconnect WebSocket
- Removing isRunning from dependencies breaks the loop
- WebSocket connection now stable during script execution

* feat: preselect SSH mode in execution modal and clean up debug logs

- Preselect SSH execution mode by default since it's the only available option
- Remove debug console logs from Terminal component
- Clean up code for production readiness

* fix: resolve build errors and warnings

- Add missing SettingsModal import to ExecutionModeModal
- Remove unused selectedMode and handleModeChange variables
- Add ESLint disable comments for intentional useEffect dependency exclusions
- Build now passes successfully with no errors or warnings

src/app/_components/ServerForm.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import type { CreateServerData } from '../../types/server';
 import { Button } from './ui/button';
 import { SSHKeyInput } from './SSHKeyInput';
@@ -23,11 +23,28 @@ export function ServerForm({ onSubmit, initialData, isEditing = false, onCancel
       ssh_key: '',
       ssh_key_passphrase: '',
       ssh_port: 22,
+      color: '#3b82f6',
     }
   );
 
   const [errors, setErrors] = useState<Partial<Record<keyof CreateServerData, string>>>({});
   const [sshKeyError, setSshKeyError] = useState<string>('');
+  const [colorCodingEnabled, setColorCodingEnabled] = useState(false);
+
+  useEffect(() => {
+    const loadColorCodingSetting = async () => {
+      try {
+        const response = await fetch('/api/settings/color-coding');
+        if (response.ok) {
+          const data = await response.json();
+          setColorCodingEnabled(Boolean(data.enabled));
+        }
+      } catch (error) {
+        console.error('Error loading color coding setting:', error);
+      }
+    };
+    void loadColorCodingSetting();
+  }, []);
 
   const validateForm = (): boolean => {
     const newErrors: Partial<Record<keyof CreateServerData, string>> = {};
@@ -95,7 +112,8 @@ export function ServerForm({ onSubmit, initialData, isEditing = false, onCancel
           auth_type: 'password',
           ssh_key: '',
           ssh_key_passphrase: '',
-          ssh_port: 22
+          ssh_port: 22,
+          color: '#3b82f6'
         });
       }
     }
@@ -206,6 +224,26 @@ export function ServerForm({ onSubmit, initialData, isEditing = false, onCancel
             <option value="both">Both Password & SSH Key</option>
           </select>
         </div>
+
+        {colorCodingEnabled && (
+          <div>
+            <label htmlFor="color" className="block text-sm font-medium text-muted-foreground mb-1">
+              Server Color
+            </label>
+            <div className="flex items-center gap-3">
+              <input
+                type="color"
+                id="color"
+                value={formData.color ?? '#3b82f6'}
+                onChange={handleChange('color')}
+                className="w-20 h-10 rounded cursor-pointer border border-border"
+              />
+              <span className="text-sm text-muted-foreground">
+                Choose a color to identify this server
+              </span>
+            </div>
+          </div>
+        )}
       </div>
 
       {/* Password Authentication */}