Add dark mode support

Author: brianyu28

Streamline/Config/AppConstants.swift

@@ -13,7 +13,11 @@ struct AppConstants {
     static let appName = "Streamline"
 
     static let colorQuickPickerField = Color(red: 0.9, green: 0.9, blue: 0.9)
+    static let colorQuickPickerFieldDark = Color(red: 0.1, green: 0.1, blue: 0.1)
+    
     static let colorQuickPickerSelected = Color(red: 84 / 255, green: 167 / 255, blue: 255 / 255)
+    static let colorQuickPickerSelectedDark = Color(red: 33 / 255, green: 44 / 255, blue: 255 / 255)
+    
     static let colorTextCaption = Color(red: 0.4, green: 0.4, blue: 0.4)
 
     static let streamlineFileType = UTType("me.brianyu.streamline")!

Streamline/Views/WorkflowsPanel/PanelResultView.swift

@@ -8,6 +8,8 @@
 import SwiftUI
 
 struct PanelResultView: View {
+    @Environment(\.colorScheme) var colorScheme
+    
     let workflow: Workflow
     let isSelected: Bool
 
@@ -21,15 +23,15 @@ struct PanelResultView: View {
                 Text(workflow.trigger)
                     .padding(.horizontal, 15)
                     .padding(.vertical, 5)
-                    .background(AppConstants.colorQuickPickerField)
+                    .background(colorScheme == .dark ? AppConstants.colorQuickPickerFieldDark : AppConstants.colorQuickPickerField)
                     .cornerRadius(10)
             }
             Text(workflow.content)
                 .frame(height: 40, alignment: .top)
         }
         .padding(10)
         .frame(height: 90)
-        .background(isSelected ? AppConstants.colorQuickPickerSelected : nil)
+        .background(isSelected ? (colorScheme == .dark ? AppConstants.colorQuickPickerSelectedDark : AppConstants.colorQuickPickerSelected) : nil)
         .cornerRadius(10)
     }
 }

Streamline/Views/WorkflowsPanel/WorkflowsPanelView.swift

@@ -8,6 +8,8 @@
 import SwiftUI
 
 struct WorkflowsPanelView: View {
+    @Environment(\.colorScheme) var colorScheme
+    
     let panel: StreamlinePanel
     let resizeWithResultsCount: (Int) -> Void
 
@@ -29,7 +31,7 @@ struct WorkflowsPanelView: View {
             TextField("Search Streamline workflows...", text: $searchText)
                 .textFieldStyle(.plain)
                 .padding(15)
-                .background(AppConstants.colorQuickPickerField)
+                .background(colorScheme == .dark ? AppConstants.colorQuickPickerFieldDark : AppConstants.colorQuickPickerField)
                 .cornerRadius(10)
                 .font(.system(size: 18))
                 .onChange(of: searchText) { searchText in