feat(assistant): the canvas, a view over the assistant daemon

The socket, the turn model and the window live in Assistant.qml, outside
the window's loader, so closing the card loses nothing and a reply keeps
streaming while it is closed. Tokens reach the model on a 50 ms tick
rather than per token. Prose goes through Notify.sanitize, because model
output can quote a search result and a remote image in it would be
fetched on render. Code blocks get a copy button once their fence closes.
The history panel lists conversations and searches them through the
daemon's full-text index.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/desktop/assistant/Message.qml b/desktop/assistant/Message.qml
new file mode 100644
index 0000000..c724c2e
--- /dev/null
+++ b/desktop/assistant/Message.qml
@@ -0,0 +1,107 @@
+// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+import QtQuick
+import ".."
+
+// One turn: the question, then the reply with its thinking line, the tool
+// chips, and an error or stopped mark. Both texts go through Segments, so
+// the question renders as markdown too.
+Column {
+    id: msg
+    required property int index
+    required property string user
+    required property string reply
+    required property string think
+    required property string tools
+    required property string error
+    required property bool live
+    required property bool stopped
+    required property bool expanded
+    required property var model         // the row, for setting expanded
+    property string running: ""          // the tool running now, if any
+
+    spacing: 6
+
+    Rectangle {
+        width: msg.width
+        height: question.height + 16
+        radius: 8
+        color: Qt.alpha(Theme.surface, 0.7)
+        Segments {
+            id: question
+            anchors { left: parent.left; right: parent.right; top: parent.top; margins: 8 }
+            text: msg.user
+        }
+    }
+
+    // Collapsed by default; a click shows the reasoning as plain text.
+    Text {
+        visible: msg.think !== ""
+        text: (msg.expanded ? "▾ " : "▸ ") + (msg.live && msg.reply === "" ? "thinking…" : "thinking")
+        color: Theme.overlay
+        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
+        MouseArea {
+            anchors.fill: parent
+            cursorShape: Qt.PointingHandCursor
+            onClicked: msg.model.expanded = !msg.expanded
+        }
+    }
+    Text {
+        width: msg.width
+        visible: msg.expanded && msg.think !== ""
+        text: msg.think
+        textFormat: Text.PlainText
+        wrapMode: Text.Wrap
+        color: Theme.subtext
+        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
+    }
+
+    Flow {
+        width: msg.width
+        spacing: 6
+        visible: msg.tools !== ""
+        Repeater {
+            model: msg.tools ? msg.tools.split(",") : []
+            Rectangle {
+                required property string modelData
+                readonly property bool on: msg.live && msg.running === modelData
+                width: chip.implicitWidth + 14
+                height: chip.implicitHeight + 6
+                radius: height / 2
+                color: Qt.alpha(Theme.surface, 0.9)
+                opacity: on ? 1 : 0.55
+                Text {
+                    id: chip
+                    anchors.centerIn: parent
+                    text: parent.modelData
+                    color: parent.on ? Theme.text : Theme.subtext
+                    font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 5 }
+                }
+            }
+        }
+    }
+
+    Segments {
+        width: msg.width
+        text: msg.reply
+        visible: msg.reply !== ""
+    }
+
+    Text {
+        visible: msg.error !== "" || msg.stopped
+        width: msg.width
+        text: msg.error !== "" ? msg.error : "stopped"
+        color: msg.error !== "" ? Theme.red : Theme.overlay
+        wrapMode: Text.Wrap
+        font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 4 }
+    }
+}