v0.8.13: tool cards paired by call id, markdown rendered while it streams

Two things the window got wrong once a real turn ran through it, plus the
switch that was invisible on a dark theme.

Tool cards (app/src/core/AgentCore.*, app/qml/Main.qml, ToolCard.qml):
- A turn that called the same tool twice left the first card on "running"
  forever and gave its result to the second card: both were paired by name.
  cst_agent_hooks_t hands the call (ctl_tool_call_t) to every callback, so the
  id travels with the signals now (toolEvent(phase, id, name, detail),
  toolResult(id, name, exitCode, output)) and findTool() matches on it, in the
  same way AgentCore::history() fills it from tool_call_id / tool_calls_json
  for a replayed session. Only a call without an id -- an old text-protocol
  session -- still falls back to the name.
- Nothing may keep spinning after a turn: closeAllRows() runs when the turn
  ends and settles every open row; a call that never came back shows "no
  result" (state "unfinished") and no longer claims an exit code.

Streaming text (app/qml/Main.qml, ChatView.qml):
- The answer was plain text while it streamed and turned into markdown only
  when the turn ended. A 120 ms timer now re-renders the open answer with the
  engine's own renderer (AgentCore::renderMarkdown -> cst_web_md_html), so a
  list, a table or a code fence fills in formatted as it arrives. A row keeps
  its own "html" field; a replayed session renders once, where its rows are
  built.

QML details:
- the Plan mode Switch got a drawn indicator: the Basic style's pill is a dark
  pill with a dark knob on this theme, which made the control look disabled.
- Every engine signal handler is a plain window function now
  (engineToolEvent, engineToolResult, engineTurnFinished, engineAssistant,
  ...), which is also what lets --uitest drive the exact path; rowJson(i)
  returns a transcript row as JSON for it (an object would not survive
  QMetaObject::invokeMethod).

Tests: 6 more checks -- a call opens a card, two calls of one tool are two
cards, the result lands on the card of its own call, the other card is
untouched, the turn end settles an open call, a delta opens a streaming answer
and markdown is rendered while it still streams. 52/52 pass, --selftest,
ctest cst-app-selftest.

Version 0.8.13.

app/qml/Sidebar.qml

@@ -273,6 +273,30 @@ Rectangle {
                         checked: side.planMode
                         implicitHeight: Theme.touchTarget
                         onClicked: side.planModeRequested(checked)
+                        /* The Basic style's indicator is a dark pill with a dark
+                         * knob here, so it is drawn: thumb-sized, accent when
+                         * on, clearly off when not. */
+                        indicator: Rectangle {
+                            implicitWidth: 44
+                            implicitHeight: 22
+                            x: planSwitch.leftPadding
+                            y: parent.height / 2 - height / 2
+                            radius: 11
+                            color: planSwitch.checked ? Theme.accentDim : Theme.surfaceAlt
+                            border.width: 1
+                            border.color: planSwitch.checked ? Theme.accent : Theme.border
+                            Rectangle {
+                                width: 16
+                                height: 16
+                                y: 2
+                                x: planSwitch.checked ? parent.width - width - 3 : 3
+                                radius: 8
+                                color: planSwitch.checked ? Theme.text : Theme.textDim
+                                Behavior on x {
+                                    NumberAnimation { duration: 120; easing.type: Easing.OutCubic }
+                                }
+                            }
+                        }
                     }
                     Text {
                         text: "Plan mode"