feat: implement comprehensive task management system with SCSS modules

- Add complete task management functionality with atomic design
- Create TaskCard component with checkbox and delete functionality
- Implement TaskForm with drawer interface for task editing
- Add Tasks organism with right-side drawer and completion states
- Move TodayProgress and QuickActions to Sidebar for better UX
- Implement SCSS modules for all components with proper styling
- Add task statistics to progress tracking
- Update store with task management actions and persistence
- Improve layout with 30/70 column split for tasks and timer
- Add SASS dependency for SCSS compilation
- Ensure completed tasks are non-editable with proper visual states

client/src/styles/TaskForm.module.scss

@@ -0,0 +1,41 @@
+.form {
+  // Form container styles
+}
+
+.formContent {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.field {
+  // Individual field container
+}
+
+.fieldGrid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 1rem;
+}
+
+.input {
+  margin-top: 0.5rem;
+}
+
+.textarea {
+  margin-top: 0.5rem;
+}
+
+.buttonGroup {
+  display: flex;
+  gap: 0.5rem;
+  padding-top: 1rem;
+}
+
+.submitButton {
+  flex: 1;
+}
+
+.cancelButton {
+  // Cancel button styles
+}