gui: use TapHandler for double-click pair selection

MouseArea's onDoubleClicked doesn't fire when placed on a TextEdit with
selectByMouse:true — the TextEdit's internal mouse handling consumes the
events. TapHandler coexists with TextEdit's mouse handling and reliably
receives double-tap events.

Double-click on a bracket or quote delimiter now selects the content
between the matching pair. Quotes use parity to decide opener/closer
direction. Falls back to word selection when no delimiter is adjacent.

Works in chat blocks (mainTextEdit, textComponent) and prompt textarea.

kde/gui/ChatBlockDelegate.qml

@@ -193,14 +193,10 @@ Column {
         // Fast path: single TextEdit for the concatenated HTML.
         // Diagrams are handled separately via the segments list.
         // Editable for scratchpad use - changes are local only, not persisted.
-        Item {
-            width: root.width
-            height: mainTextEdit.height
-            visible: !hasDiagrams()
-
         TextEdit {
             id: mainTextEdit
-                width: parent.width
+            width: root.width
+            visible: !hasDiagrams()
             text: root.blockRenderedHtml
             textFormat: Text.RichText
             selectByMouse: true
@@ -210,35 +206,26 @@ Column {
             font.pointSize: theme.fontSize > 0 ? theme.fontSize : 12
             selectionColor: theme.highlightColor
             selectedTextColor: theme.highlightedTextColor
+
+            // Double-click: bracket/quote pair or word select
+            TapHandler {
+                acceptedButtons: Qt.LeftButton
+                onDoubleTapped: function(eventPoint, button) {
+                    var pos = eventPoint.position
+                    if (!TextSelection.selectBracketPair(mainTextEdit, pos.x, pos.y)) {
+                        TextSelection.selectWordAt(mainTextEdit, pos.x, pos.y)
+                    }
+                }
             }
 
             // Acme-style mouse handling: B2=execute, B3=plumb
             // B1+B2=cut, B1+B3=paste (chord detection)
-            // Double-click on bracket: select text between matching pair
             MouseArea {
                 anchors.fill: parent
-                acceptedButtons: Qt.LeftButton | Qt.MiddleButton | Qt.RightButton
+                acceptedButtons: Qt.MiddleButton | Qt.RightButton
-                z: 1
+                cursorShape: Qt.IBeamCursor
-
-                onDoubleClicked: function(mouse) {
-                    if (mouse.button === Qt.LeftButton) {
-                        // Delimiter under cursor: select the pair.
-                        // Otherwise select the word ourselves (the overlay
-                        // swallows the event, so TextEdit won't do it).
-                        if (!TextSelection.selectBracketPair(mainTextEdit, mouse.x, mouse.y)) {
-                            TextSelection.selectWordAt(mainTextEdit, mouse.x, mouse.y)
-                        }
-                        mouse.accepted = true
-                    }
-                }
 
                 onPressed: function(mouse) {
-                    // Left button single clicks pass through to TextEdit for selection
-                    if (mouse.button === Qt.LeftButton) {
-                        mouse.accepted = false
-                        return
-                    }
-                    
                     if (mouse.buttons & Qt.LeftButton) {
                         if (mouse.button === Qt.MiddleButton) {
                             mainTextEdit.cut()
@@ -261,7 +248,6 @@ Column {
                             if (sel && sel.trim() !== "") {
                                 plumber.plumb(sel.trim(), sessionCwd())
                             } else {
-                                // No selection - expand word and highlight it
                                 selectAndPlumb(mainTextEdit, mouse.x, mouse.y)
                             }
                         }
@@ -401,29 +387,25 @@ Column {
             selectionColor: theme.highlightColor
             selectedTextColor: theme.highlightedTextColor
 
-            // Acme-style mouse handling with chord support
+            // Double-click: bracket/quote pair or word select
+            TapHandler {
+                acceptedButtons: Qt.LeftButton
+                onDoubleTapped: function(eventPoint, button) {
+                    var pos = eventPoint.position
+                    if (!TextSelection.selectBracketPair(textEdit, pos.x, pos.y)) {
+                        TextSelection.selectWordAt(textEdit, pos.x, pos.y)
+                    }
+                }
+            }
+
+            // Acme-style mouse handling: B2=execute, B3=plumb
             // B1+B2=cut, B1+B3=paste (chord detection)
-            // Double-click on bracket: select text between matching pair
             MouseArea {
                 anchors.fill: parent
-                acceptedButtons: Qt.LeftButton | Qt.MiddleButton | Qt.RightButton
+                acceptedButtons: Qt.MiddleButton | Qt.RightButton
                 cursorShape: Qt.IBeamCursor
 
-                onDoubleClicked: function(mouse) {
-                    if (mouse.button === Qt.LeftButton) {
-                        if (!TextSelection.selectBracketPair(textEdit, mouse.x, mouse.y)) {
-                            TextSelection.selectWordAt(textEdit, mouse.x, mouse.y)
-                        }
-                        mouse.accepted = true
-                    }
-                }
-
                 onPressed: function(mouse) {
-                    if (mouse.button === Qt.LeftButton) {
-                        mouse.accepted = false
-                        return
-                    }
-
                     if (mouse.buttons & Qt.LeftButton) {
                         if (mouse.button === Qt.MiddleButton) {
                             textEdit.cut()
@@ -441,7 +423,6 @@ Column {
                         }
                         mouse.accepted = true
                     } else if (mouse.button === Qt.RightButton) {
-                        // B3: Plumb selection or word under cursor
                         if (plumber.available()) {
                             var sel = textEdit.selectedText
                             if (sel && sel.trim() !== "") {

kde/gui/ChatPane.qml

@@ -467,11 +467,21 @@ Item {
                                     event.accepted = true
                                 }
                             }
+
+                            // Double-click: bracket/quote pair or word select
+                            TapHandler {
+                                acceptedButtons: Qt.LeftButton
+                                onDoubleTapped: function(eventPoint, button) {
+                                    var pos = eventPoint.position
+                                    if (!TextSelection.selectBracketPair(promptInput, pos.x, pos.y)) {
+                                        TextSelection.selectWordAt(promptInput, pos.x, pos.y)
+                                    }
+                                }
+                            }
                         }
                     }
 
                     // Acme-style mouse chording overlay
-                    // B1 double-click = bracket/quote pair or word select
                     // B2 = execute selection
                     // B3 = plumb selection / context menu
                     // B1+B2 = cut (snarf)
@@ -479,67 +489,43 @@ Item {
                     MouseArea {
                         id: chordArea
                         anchors.fill: parent
-                        acceptedButtons: Qt.LeftButton | Qt.MiddleButton | Qt.RightButton
+                        acceptedButtons: Qt.MiddleButton | Qt.RightButton
                         propagateComposedEvents: true
                         cursorShape: Qt.IBeamCursor
 
                         // Track if B1 (left) is currently held for chord detection
                         property bool leftHeld: false
 
-                        onDoubleClicked: function(mouse) {
-                            if (mouse.button === Qt.LeftButton) {
-                                // Map coordinates from chordArea to promptInput
-                                var mappedPos = chordArea.mapToItem(promptInput, mouse.x, mouse.y)
-                                if (!TextSelection.selectBracketPair(promptInput, mappedPos.x, mappedPos.y)) {
-                                    TextSelection.selectWordAt(promptInput, mappedPos.x, mappedPos.y)
-                                }
-                                mouse.accepted = true
-                            }
-                        }
-
                         onPressed: function(mouse) {
-                            // Left button single clicks pass through to TextArea for selection
-                            if (mouse.button === Qt.LeftButton) {
-                                mouse.accepted = false
-                                return
-                            }
-
                             // Check if this is a chord (B1 already held)
                             if (mouse.buttons & Qt.LeftButton) {
                                 leftHeld = true
                                 if (mouse.button === Qt.MiddleButton) {
-                                    // B1+B2 = cut
                                     promptInput.cut()
                                     mouse.accepted = true
                                     return
                                 } else if (mouse.button === Qt.RightButton) {
-                                    // B1+B3 = paste
                                     promptInput.paste()
                                     mouse.accepted = true
                                     return
                                 }
                             }
                             leftHeld = false
-                            mouse.accepted = false  // Let it propagate for non-chord
+                            mouse.accepted = false
                         }
 
                         onClicked: function(mouse) {
-                            // Only handle non-chord clicks
                             if (leftHeld) {
                                 leftHeld = false
                                 return
                             }
 
                             if (mouse.button === Qt.MiddleButton) {
-                                // B2: Execute selection as prompt
                                 var sel = promptInput.selectedText
                                 if (sel && sel.trim() !== "") {
                                     ollie.submit(sel.trim())
-                                } else {
-                                    // No selection - ignore
                                 }
                             } else if (mouse.button === Qt.RightButton) {
-                                // B3: Plumb selection or word under cursor
                                 if (!plumber.available()) return
                                 var sel = promptInput.selectedText
                                 if (sel && sel.trim() !== "") {