Harden ultracode inline onclick handlers against XSS

The ultracode run/agent cards and minimized-tab badges built inline onclick
handlers by interpolating escapeHtml(value) inside single-quoted JavaScript
strings within an HTML attribute:

    onclick="app.openUltracodeAgentWindow('${escapeHtml(agentId)}', ...)"

escapeHtml maps ' -> ', but the browser HTML-decodes the attribute value
before the handler source is parsed, so ' becomes a literal ' again and a
quote in a run/agent/session id breaks out of the string literal into
executable JS. escapeHtml alone is insufficient for the JS-string-within-HTML-
attribute double context.

Switch each handler to escapeHtml(JSON.stringify(value)): JSON.stringify
JS-encodes and quote-wraps the value, then escapeHtml handles the HTML
attribute layer, so the value round-trips as an inert string argument. This
matches the encoding already used by other handlers in these files.

Affected:
- ultracode-panel.js: selectWorkflowRun, openUltracodeAgentWindow
- ultracode-windows.js: restore/dismiss for minimized run and agent tabs

src/web/public/ultracode-panel.js

@@ -204,7 +204,7 @@ Object.assign(CodemanApp.prototype, {
       phasesHtml = `<div class="ultracode-phase-list">${chips.join('')}</div>`;
     }
     return (
-      `<div class="ultracode-run-item${active ? ' selected' : ''}" onclick="app.selectWorkflowRun('${escapeHtml(r.runId)}')">` +
+      `<div class="ultracode-run-item${active ? ' selected' : ''}" onclick="app.selectWorkflowRun(${escapeHtml(JSON.stringify(r.runId))})">` +
       `<div class="ultracode-run-head"><span class="ultracode-run-name">${name}</span>` +
       `<span class="ultracode-status ${statusCls}">${escapeHtml(status || '—')}</span></div>` +
       `<div class="ultracode-run-stats">${escapeHtml(stats)}</div>` +
@@ -279,7 +279,7 @@ Object.assign(CodemanApp.prototype, {
     const cardStateCls = state === 'done' ? ' uw-state-done' : state === 'progress' ? ' uw-state-working' : '';
     const cardAttrs = clickable
       ? ` class="ultracode-agent-card ultracode-agent-card--clickable${cardStateCls}" role="button" tabindex="0"` +
-        ` title="View transcript" onclick="app.openUltracodeAgentWindow('${escapeHtml(a.agentId)}','${escapeHtml(runId || '')}')"`
+        ` title="View transcript" onclick="app.openUltracodeAgentWindow(${escapeHtml(JSON.stringify(a.agentId))},${escapeHtml(JSON.stringify(runId || ''))})"`
       : ` class="ultracode-agent-card${cardStateCls}"`;
     return (
       `<div${cardAttrs}>` +