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/ChatView.qml

@@ -40,9 +40,11 @@ Item {
                     role: model.role
                     text: model.text
                     complete: model.complete
-                    html: (model.role === "agent" || model.role === "error") &&
-                          (model.complete || model.text.length > 12000) &&
-                          model.text.length > 0
+                    /* html comes from the streaming renderer (Main.qml) or,
+                     * for a replayed session, from here once. */
+                    html: model.html.length > 0 ? model.html
+                        : (model.role === "agent" || model.role === "error") &&
+                          model.complete && model.text.length > 0
                           ? agent.renderMarkdown(model.text) : ""
                 }
             }
@@ -56,6 +58,7 @@ Item {
             Component {
                 id: toolComp
                 ToolCard {
+                    objectName: "toolCard"
                     name: model.name
                     state: model.state
                     detail: model.detail