fix(jetbrains): underline prompt attachment file links

Remove the remaining prompt attachment strip border and reuse the shared underlined file-link styling for attachment chip labels so clickable files look consistent in the transcript.

packages/kilo-jetbrains/frontend/src/main/kotlin/ai/kilocode/client/session/ui/FileLinkText.kt

@@ -0,0 +1,14 @@
+package ai.kilocode.client.session.ui
+
+import com.intellij.xml.util.XmlStringUtil
+
+internal fun fileLinkText(value: String): String = value.lineSequence()
+    .map { it.trim() }
+    .filter { it.isNotEmpty() }
+    .joinToString(" ")
+
+internal fun fileLinkHtml(value: String): String {
+    val text = fileLinkText(value)
+    if (text.isBlank()) return ""
+    return XmlStringUtil.wrapInHtml("<nobr><u>${XmlStringUtil.escapeString(text)}</u></nobr>")
+}

packages/kilo-jetbrains/frontend/src/main/kotlin/ai/kilocode/client/session/ui/attachment/AttachmentCard.kt

@@ -1,6 +1,7 @@
 package ai.kilocode.client.session.ui.attachment
 
 import ai.kilocode.client.plugin.KiloBundle
+import ai.kilocode.client.session.ui.fileLinkHtml
 import ai.kilocode.client.session.ui.style.SessionUiStyle
 import ai.kilocode.client.ui.UiStyle
 import ai.kilocode.client.ui.iconButton
@@ -68,7 +69,7 @@ class AttachmentChip(
         cursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)
         toolTipText = tip
         accessibleContext?.accessibleName = KiloBundle.message("prompt.attachment.open", item.name)
-        val label = JBLabel(label()).apply {
+        val label = JBLabel(fileLinkHtml(label())).apply {
             icon = attachmentIcon(item.mime, item.name)
             iconTextGap = JBUI.scale(SessionUiStyle.View.Attachment.CHIP_ICON_GAP)
             toolTipText = tip

packages/kilo-jetbrains/frontend/src/main/kotlin/ai/kilocode/client/session/views/PromptAttachmentView.kt

@@ -27,8 +27,9 @@ class PromptAttachmentView(
     private val cards = LinkedHashMap<String, JComponent>()
     private val row = Stack.horizontal(gap = UiStyle.Gap.sm())
     private val scroll = JBScrollPane(row).apply {
-        border = null
-        viewportBorder = null
+        // Empty borders remove the visible scroll pane frame; null can be replaced by the current UI.
+        border = JBUI.Borders.empty()
+        viewportBorder = JBUI.Borders.empty()
         isOpaque = false
         viewport.isOpaque = false
         horizontalScrollBarPolicy = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED

packages/kilo-jetbrains/frontend/src/main/kotlin/ai/kilocode/client/session/views/tool/ToolSupport.kt

@@ -7,6 +7,8 @@ import ai.kilocode.client.session.SessionFileOpener
 import ai.kilocode.client.session.model.Tool
 import ai.kilocode.client.session.model.ToolExecState
 import ai.kilocode.client.session.model.ToolKind
+import ai.kilocode.client.session.ui.fileLinkHtml
+import ai.kilocode.client.session.ui.fileLinkText
 import ai.kilocode.client.session.ui.selection.SessionSelection
 import ai.kilocode.client.session.ui.selection.SessionCopyTarget
 import ai.kilocode.client.session.ui.style.SessionEditorStyle
@@ -135,8 +137,8 @@ class FileLinkLabel(
 
     @RequiresEdt
     fun setTarget(path: String?, text: String): Boolean {
-        val next = single(text.ifBlank { path.orEmpty() })
-        val value = if (next.isBlank()) "" else XmlStringUtil.wrapInHtml("<nobr><u>${XmlStringUtil.escapeString(next)}</u></nobr>")
+        val next = fileLinkText(text.ifBlank { path.orEmpty() })
+        val value = fileLinkHtml(next)
         var changed = false
         if (href != path) {
             href = path
@@ -489,7 +491,7 @@ internal fun setText(label: JBLabel, text: String): Boolean {
 
 @RequiresEdt
 internal fun setTargetText(label: JBLabel, text: String): Boolean {
-    val value = single(text)
+    val value = fileLinkText(text)
     if (label.text == value) return false
     label.text = value
     return true
@@ -511,16 +513,11 @@ private fun <T : JBLabel> clip(label: T): T = label.apply {
 }
 
 private fun html(text: String): String {
-    val value = single(text)
+    val value = fileLinkText(text)
     if (value.isBlank()) return ""
     return XmlStringUtil.wrapInHtml("<nobr>${XmlStringUtil.escapeString(value)}</nobr>")
 }
 
-private fun single(text: String): String = text.lineSequence()
-    .map { it.trim() }
-    .filter { it.isNotEmpty() }
-    .joinToString(" ")
-
 @RequiresEdt
 internal fun show(parts: ToolParts, link: Boolean): Boolean {
     var changed = false

packages/kilo-jetbrains/frontend/src/test/kotlin/ai/kilocode/client/session/ui/SessionUiUpdateTest.kt

@@ -383,7 +383,7 @@ class SessionUiUpdateTest : BasePlatformTestCase() {
         val chip = find(view, AttachmentChip::class.java)
 
         assertNotNull(chip)
-        assertTrue(findAll(chip!!, JBLabel::class.java).any { it.text == "HvJwtFilter.java:12-40" })
+        assertTrue(findAll(chip!!, JBLabel::class.java).any { it.text.contains("<u>HvJwtFilter.java:12-40</u>") })
     }
 
     fun `test source backed image attachment still renders in prompt strip`() {

packages/kilo-jetbrains/frontend/src/test/kotlin/ai/kilocode/client/session/views/PromptAttachmentViewTest.kt

@@ -5,6 +5,8 @@ import ai.kilocode.client.session.ui.attachment.AttachmentCardItem
 import ai.kilocode.client.session.ui.attachment.AttachmentChip
 import ai.kilocode.client.ui.UiStyle
 import com.intellij.testFramework.fixtures.BasePlatformTestCase
+import com.intellij.ui.components.JBLabel
+import java.awt.Container
 
 class PromptAttachmentViewTest : BasePlatformTestCase() {
     // The attachment strip should line up with the prompt text horizontally and keep only a
@@ -22,8 +24,14 @@ class PromptAttachmentViewTest : BasePlatformTestCase() {
     fun `test attachment scroll pane has no border line`() {
         val scroll = PromptAttachmentView("m1") {}.scrollPane()
 
-        assertNull(scroll.border)
-        assertNull(scroll.viewportBorder)
+        assertEquals(0, scroll.border.getBorderInsets(scroll).top)
+        assertEquals(0, scroll.border.getBorderInsets(scroll).left)
+        assertEquals(0, scroll.border.getBorderInsets(scroll).bottom)
+        assertEquals(0, scroll.border.getBorderInsets(scroll).right)
+        assertEquals(0, scroll.viewportBorder.getBorderInsets(scroll).top)
+        assertEquals(0, scroll.viewportBorder.getBorderInsets(scroll).left)
+        assertEquals(0, scroll.viewportBorder.getBorderInsets(scroll).bottom)
+        assertEquals(0, scroll.viewportBorder.getBorderInsets(scroll).right)
     }
 
     // With the outline removed, the chip owns no internal padding; alignment comes from the
@@ -41,4 +49,24 @@ class PromptAttachmentViewTest : BasePlatformTestCase() {
         assertEquals(0, chip.top)
         assertEquals(0, chip.bottom)
     }
+
+    fun `test attachment chip uses file link underline style`() {
+        val chip = AttachmentChip(
+            AttachmentCardItem("HvJwtFilter.java", "text/plain", "file:///HvJwtFilter.java"),
+            file = true,
+            startLine = 40,
+            endLine = 42,
+        )
+        val label = components(chip).filterIsInstance<JBLabel>().single()
+
+        assertTrue(label.text.contains("<u>HvJwtFilter.java:40-42</u>"))
+    }
+
+    private fun components(root: Container): List<java.awt.Component> = buildList {
+        fun visit(comp: java.awt.Component) {
+            add(comp)
+            if (comp is Container) comp.components.forEach { visit(it) }
+        }
+        visit(root)
+    }
 }