fix(assistant): keep focus in the card, scope errors, guard links

From review of the canvas. Escape stopped working in three ways, each
leaving the keyboard grabbed with nothing to receive it: the history
field hiding took focus with it, a disabled input could not hold focus
while the daemon was down, and a click in a streaming reply focused text
the next flush destroyed. The card now gives focus back to the input
whenever it falls out, and the input is read-only rather than disabled.

Only an error the daemon marks as ending the reply (turn) closes the live
row; a command error, possibly another client's, used to freeze the reply
mid-stream. The running tool comes from state events, hello included.
Scrolling up during a stream no longer snaps back, since following stops
when a movement starts. History snippets go through Notify.sanitize like
any model output, links open only for http, https and mailto, and a line
opening with inline triple-backtick code is no longer taken as a fence.

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

1 files changed, 19 insertions, 1 deletions

diff --git a/desktop/assistant/Card.qml b/desktop/assistant/Card.qml
index 543edd1..ab80d1b 100644
--- a/desktop/assistant/Card.qml
+++ b/desktop/assistant/Card.qml
@@ -34,6 +34,21 @@ Rectangle {
 
     Component.onCompleted: input.forceActiveFocus()
 
+    // Focus falls out of the card when its holder goes: the history field
+    // hiding, or a streaming reply's text rebuilt under a click. With the
+    // keyboard grabbed, nothing would then reach Escape. Give it back.
+    Connections {
+        target: card.Window.window
+        function onActiveFocusItemChanged() {
+            const f = card.Window.activeFocusItem;
+            if (!f || f === card.Window.contentItem) Qt.callLater(() => input.forceActiveFocus());
+        }
+    }
+    Connections {
+        target: card.canvas
+        function onHistoryOpenChanged() { if (!card.canvas.historyOpen) input.forceActiveFocus(); }
+    }
+
     // --- header ---
 
     Item {
@@ -91,6 +106,7 @@ Rectangle {
         // Follow the bottom while a reply streams, unless the user scrolled
         // up to read; scrolling back to the end resumes following.
         property bool stick: true
+        onMovementStarted: stick = false
         onMovementEnded: stick = atYEnd
         onContentHeightChanged: if (stick) Qt.callLater(positionViewAtEnd)
         Component.onCompleted: positionViewAtEnd()
@@ -153,7 +169,9 @@ Rectangle {
                     width: scroller.width
                     wrapMode: TextEdit.Wrap
                     selectByMouse: true
-                    enabled: card.canvas.connected
+                    // readOnly, not disabled: a disabled item cannot hold the
+                    // focus that Escape needs to reach the card.
+                    readOnly: !card.canvas.connected
                     color: Theme.text
                     font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 2 }
                     onCursorRectangleChanged: scroller.follow(cursorRectangle)