refactor(diff): remove unused diff-related code and simplify diff handling

- Remove unused imports and commented-out code in `SingleFileDiffView.kt`.
- Simplify diff handling by directly calling `viewDiffAction` instead of `showDiff`.
- Clean up `DiffStreamHandler.kt` by removing unnecessary code.

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/diff/DiffStreamHandler.kt

@@ -222,7 +222,6 @@ class DiffStreamHandler(
         }
     }
 
-
     private fun createDiffBlock(): VerticalDiffBlock {
         val diffBlock = VerticalDiffBlock(
             editor, project, curLine.index, ::handleDiffBlockAcceptOrReject, ::acceptAll

core/src/main/kotlin/cc/unitmesh/devti/sketch/ui/patch/SingleFileDiffView.kt

@@ -6,8 +6,6 @@ import cc.unitmesh.devti.sketch.ui.LangSketch
 import cc.unitmesh.devti.template.GENIUS_CODE
 import cc.unitmesh.devti.template.TemplateRender
 import cc.unitmesh.devti.template.context.TemplateContext
-import com.intellij.diff.editor.ChainDiffVirtualFile
-import com.intellij.diff.editor.DiffEditorTabFilesManager
 import com.intellij.diff.editor.DiffVirtualFileBase
 import com.intellij.icons.AllIcons
 import com.intellij.lang.Language
@@ -30,7 +28,6 @@ import com.intellij.ui.JBColor
 import com.intellij.ui.components.JBLabel
 import com.intellij.ui.components.panels.HorizontalLayout
 import com.intellij.ui.components.panels.VerticalLayout
-import com.intellij.util.ui.UIUtil
 import java.awt.BorderLayout
 import java.awt.event.MouseAdapter
 import java.awt.event.MouseEvent
@@ -128,50 +125,6 @@ class SingleFileDiffView(
         mainPanel.add(contentPanel)
     }
 
-    private fun showDiff() {
-        viewDiffAction()
-//        if (diffFile != null) {
-//            showDiffFile(diffFile!!)
-//            return true
-//        }
-//
-//        val document = FileDocumentManager.getInstance().getDocument(currentFile) ?: return false
-//        val appliedPatch = GenericPatchApplier.apply(document.text, patch.hunks)
-//            ?: return false
-//
-//        val newText = appliedPatch.patchedText
-//        val diffFactory = DiffContentFactoryEx.getInstanceEx()
-//        val currentDocContent = diffFactory.create(myProject, currentFile)
-//        val newDocContent = diffFactory.create(newText)
-//
-//        val diffRequest =
-//            SimpleDiffRequest(
-//                "Shire Diff - ${patch.beforeFileName}",
-//                currentDocContent,
-//                newDocContent,
-//                "Original",
-//                "AI generated"
-//            )
-//
-//        val producer = SimpleDiffRequestProducer.create(currentFile.path) {
-//            diffRequest
-//        }
-//
-//        val chain = SimpleDiffRequestChain.fromProducer(producer)
-//        runInEdt {
-//            diffFile = ChainDiffVirtualFile(chain, "Diff")
-//            showDiffFile(diffFile!!)
-//        }
-//
-//        return true
-    }
-
-    private val diffEditorTabFilesManager = DiffEditorTabFilesManager.getInstance(myProject)
-
-    private fun showDiffFile(diffFile: ChainDiffVirtualFile) {
-        diffEditorTabFilesManager.showDiffFile(diffFile, true)
-    }
-
     private fun createActionButtons(): List<JButton> {
         val undoManager = UndoManager.getInstance(myProject)
         val fileEditor = FileEditorManager.getInstance(myProject).getSelectedEditor(currentFile)
@@ -196,7 +149,7 @@ class SingleFileDiffView(
 
             addMouseListener(object : MouseAdapter() {
                 override fun mouseClicked(e: MouseEvent?) {
-                    showDiff()
+                    this@SingleFileDiffView.viewDiffAction()
                 }
             })
         }
@@ -248,26 +201,6 @@ class SingleFileDiffView(
         return listOf(rollback, viewDiffButton, runStreamButton, repairButton)
     }
 
-    private fun showStreamDiff() {
-        FileEditorManager.getInstance(myProject).openFile(currentFile, true)
-        val editor = FileEditorManager.getInstance(myProject).selectedTextEditor ?: return
-        val newText = appliedPatch!!.patchedText
-
-        val diffStreamHandler = DiffStreamHandler(
-            myProject,
-            editor = editor,
-            0,
-            oldCode.lines().size,
-            onClose = {
-            },
-            onFinish = {
-
-            })
-
-        diffStreamHandler.normalDiff(oldCode, newText)
-    }
-
-
     override fun getViewText(): String = currentFile.readText()
 
     override fun updateViewText(text: String) {}