fix: Per-agent terminal isolation, floating terminal z-index, and char-by-char input

- Add :key to PromptBar to force remount on agent switch, fixing shared terminal session bug
- Raise AgentTerminal z-index above PromptBar backdrop so floating terminal is visible/clickable
- Send prompt text char-by-char (15ms delay) matching FloatingVoice pattern for Claude Code compat
- Guard xterm dispose against unloaded addons to prevent errors on agent switch
- Widen PromptBar panel from 360px to 420px to fit all ChatInput buttons

server/routes/transcript.ts

@@ -1,12 +1,44 @@
 import { jsonResponse, errorResponse } from '../utils/cors'
-import { getTranscriptAnalysis, listSessions } from '../services/transcript-engine'
+import { getTranscriptAnalysis, listSessions, getActiveSession, resetSessionOffset, getClaudeStats, getClaudeUsage } from '../services/transcript-engine'
 import type { TranscriptAnalysis } from '../services/transcript-engine'
 
+export function handleClaudeUsage(): Response {
+  const usage = getClaudeUsage()
+  if (!usage) return errorResponse('Usage data not available', 404)
+  return jsonResponse(usage)
+}
+
+export function handleClaudeStats(): Response {
+  const stats = getClaudeStats()
+  if (!stats) return errorResponse('Stats not available', 404)
+  return jsonResponse(stats)
+}
+
 export function handleTranscriptSessions(): Response {
   const sessions = listSessions()
   return jsonResponse(sessions)
 }
 
+export function handleTranscriptActive(req: Request, url: URL): Response {
+  if (req.method !== 'GET') return errorResponse('Method not allowed', 405)
+
+  const agent = url.searchParams.get('agent') || 'main'
+  const activeSession = getActiveSession(agent)
+
+  const sessionId = activeSession?.sessionId
+  const analysis = getTranscriptAnalysis(sessionId, activeSession?.transcriptPath)
+
+  if (!analysis) return errorResponse('No active session found', 404)
+
+  // Reset offset so future incrementals start from here
+  resetSessionOffset(analysis.sessionId)
+
+  return jsonResponse({
+    ...analysis,
+    messages: analysis.messages.filter(m => !m.isMeta)
+  })
+}
+
 export function handleTranscript(req: Request, url: URL, sessionId: string): Response {
   if (req.method !== 'GET') return errorResponse('Method not allowed', 405)
 
@@ -63,7 +95,8 @@ function handleSection(analysis: TranscriptAnalysis, section: string): Response
         version: analysis.version,
         duration: analysis.duration,
         startTime: analysis.startTime,
-        endTime: analysis.endTime
+        endTime: analysis.endTime,
+        lastStopReason: analysis.lastStopReason
       })
     case 'files':
       return jsonResponse({