feat(ui): add version display action and status bar widget

* Implement PgTidyShowVersionAction to show pgtidy version
* Create PgTidyStatusBarWidget for real-time version display
* Update plugin.xml to register new action and widget

editors/datagrip/src/main/kotlin/com/pgtidy/datagrip/PgTidyShowVersionAction.kt

@@ -0,0 +1,42 @@
+package com.pgtidy.datagrip
+
+import com.intellij.openapi.actionSystem.AnAction
+import com.intellij.openapi.actionSystem.AnActionEvent
+import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.progress.ProgressIndicator
+import com.intellij.openapi.progress.Task
+import com.intellij.openapi.ui.Messages
+
+class PgTidyShowVersionAction : AnAction() {
+
+    override fun actionPerformed(e: AnActionEvent) {
+        val project = e.project
+
+        object : Task.Backgroundable(project, "PgTidy: checking version…", false) {
+            override fun run(indicator: ProgressIndicator) {
+                val proc = try {
+                    ProcessBuilder("pgtidy", "version")
+                        .redirectErrorStream(false)
+                        .start()
+                } catch (ex: Exception) {
+                    ApplicationManager.getApplication().invokeLater {
+                        Messages.showErrorDialog(project, "Cannot start pgtidy: ${ex.message}", "PgTidy")
+                    }
+                    return
+                }
+
+                val output = proc.inputStream.bufferedReader().readText()
+                val stderr = proc.errorStream.bufferedReader().readText()
+                val exit = proc.waitFor()
+
+                ApplicationManager.getApplication().invokeLater {
+                    if (exit != 0) {
+                        Messages.showErrorDialog(project, stderr.ifBlank { "pgtidy exited with code $exit" }, "PgTidy")
+                        return@invokeLater
+                    }
+                    Messages.showInfoMessage(project, output.trim(), "PgTidy Version")
+                }
+            }
+        }.queue()
+    }
+}

editors/datagrip/src/main/kotlin/com/pgtidy/datagrip/PgTidyStatusBarWidget.kt

@@ -0,0 +1,72 @@
+package com.pgtidy.datagrip
+
+import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.wm.StatusBar
+import com.intellij.openapi.wm.StatusBarWidget
+import com.intellij.openapi.wm.StatusBarWidgetFactory
+import com.intellij.util.Consumer
+import java.awt.event.MouseEvent
+
+private const val WIDGET_ID = "com.pgtidy.StatusBarWidget"
+
+class PgTidyStatusBarWidget(private val project: Project) : StatusBarWidget, StatusBarWidget.TextPresentation {
+
+    private var statusBar: StatusBar? = null
+    private var text: String = "pgtidy: …"
+
+    override fun ID(): String = WIDGET_ID
+
+    override fun install(statusBar: StatusBar) {
+        this.statusBar = statusBar
+        refresh()
+    }
+
+    override fun dispose() {
+        statusBar = null
+    }
+
+    override fun getPresentation(): StatusBarWidget.WidgetPresentation = this
+
+    override fun getText(): String = text
+
+    override fun getAlignment(): Float = java.awt.Component.CENTER_ALIGNMENT
+
+    override fun getTooltipText(): String = "PgTidy version — click to refresh"
+
+    override fun getClickConsumer(): Consumer<MouseEvent> = Consumer { refresh() }
+
+    fun refresh() {
+        ApplicationManager.getApplication().executeOnPooledThread {
+            text = try {
+                val proc = ProcessBuilder("pgtidy", "version")
+                    .redirectErrorStream(true)
+                    .start()
+                val output = proc.inputStream.bufferedReader().readText().trim()
+                val exit = proc.waitFor()
+                if (exit == 0 && output.isNotBlank()) output else "pgtidy: not found"
+            } catch (ex: Exception) {
+                "pgtidy: not found"
+            }
+            ApplicationManager.getApplication().invokeLater {
+                statusBar?.updateWidget(WIDGET_ID)
+            }
+        }
+    }
+}
+
+class PgTidyStatusBarWidgetFactory : StatusBarWidgetFactory {
+    override fun getId(): String = WIDGET_ID
+
+    override fun getDisplayName(): String = "PgTidy Version"
+
+    override fun isAvailable(project: Project): Boolean = true
+
+    override fun createWidget(project: Project): StatusBarWidget = PgTidyStatusBarWidget(project)
+
+    override fun disposeWidget(widget: StatusBarWidget) {
+        widget.dispose()
+    }
+
+    override fun canBeEnabledOn(statusBar: StatusBar): Boolean = true
+}

editors/datagrip/src/main/resources/META-INF/plugin.xml

@@ -21,8 +21,20 @@
             <add-to-group group-id="EditorPopupMenu" anchor="first"/>
             <keyboard-shortcut keymap="$default" first-keystroke="ctrl alt shift P"/>
         </action>
+        <action id="com.pgtidy.ShowVersion"
+                class="com.pgtidy.datagrip.PgTidyShowVersionAction"
+                text="Show PgTidy Version"
+                description="Show the installed pgtidy binary version">
+            <add-to-group group-id="ToolsMenu" anchor="last"/>
+        </action>
     </actions>
 
+    <extensions defaultExtensionNs="com.intellij">
+        <statusBarWidgetFactory id="com.pgtidy.StatusBarWidget"
+                                 implementation="com.pgtidy.datagrip.PgTidyStatusBarWidgetFactory"
+                                 order="last"/>
+    </extensions>
+
     <extensions defaultExtensionNs="com.redhat.devtools.lsp4ij">
         <server id="com.pgtidy.lsp"
                 name="PgTidy"