refactor(ui): improve layout and styling in AutoDevPlanerToolWindow #331

- Replace direct `add(planSketch)` with a resizable panel layout using `panel` DSL.
- Remove unnecessary vertical struts in `PlanSketch`.
- Set background color for `TaskPanel` to match theme.

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/gui/AutoDevPlanerToolWindowFactory.kt

@@ -14,6 +14,9 @@ import com.intellij.openapi.wm.ToolWindow
 import com.intellij.openapi.wm.ToolWindowFactory
 import com.intellij.openapi.wm.ToolWindowManager
 import com.intellij.openapi.wm.ex.ToolWindowManagerListener
+import com.intellij.ui.dsl.builder.panel
+import com.intellij.util.ui.JBUI
+import java.awt.BorderLayout
 import java.util.concurrent.atomic.AtomicBoolean
 
 class AutoDevPlanerToolWindowFactory : ToolWindowFactory, ToolWindowManagerListener, DumbAware {
@@ -53,7 +56,15 @@ class AutoDevPlanerTooWindow(val project: Project) : SimpleToolWindowPanel(true,
     var planSketch: PlanSketch = PlanSketch(project, "", mutableListOf(), true)
 
     init {
-        add(planSketch)
+        val planPanel = panel {
+            row {
+                cell(planSketch).resizableColumn()
+            }
+        }.apply {
+            border = JBUI.Borders.empty(8)
+        }
+
+        add(planPanel, BorderLayout.CENTER)
 
         connection.subscribe(PlanUpdateListener.TOPIC, object : PlanUpdateListener {
             override fun onPlanUpdate(items: MutableList<AgentTaskEntry>) {

core/src/main/kotlin/cc/unitmesh/devti/sketch/ui/plan/PlanSketch.kt

@@ -34,10 +34,6 @@ class PlanController(
             }
 
             contentPanel.add(sectionPanel)
-            
-            if (index < agentTaskItems.size - 1) {
-                contentPanel.add(Box.createVerticalStrut(8))
-            }
         }
 
         contentPanel.revalidate()

core/src/main/kotlin/cc/unitmesh/devti/sketch/ui/plan/TaskPanel.kt

@@ -27,11 +27,10 @@ class TaskPanel(
     private val task: AgentPlanStep,
     private val onStatusChange: () -> Unit
 ) : JBPanel<JBPanel<*>>(FlowLayout(FlowLayout.LEFT, 2, 0)) {
-
     private val taskLabel: JLabel
 
     init {
-        border = JBUI.Borders.empty(1, 16, 1, 0)
+        border = JBUI.Borders.empty(4, 16, 4, 0)
         taskLabel = createStyledTaskLabel()
 
         val statusIcon = createStatusIcon()
@@ -42,6 +41,8 @@ class TaskPanel(
         }
 
         add(taskLabel)
+
+        background = JBUI.CurrentTheme.ToolWindow.background()
         setupContextMenu()
     }