fix: clients sync to server terminals instead of creating new ones

- Remove auto-creation of terminal sessions from init/selectSession/switchAgent
- Clients only connect to existing alive terminals from server registry
- Remove localStorage persistence (agent/sessionId) — state derived from server
- Refine session-state types: new AgentStatus values, LastError interface
- UI improvements: AgentBadge, ChatContainer, UserInput, BashCard updates
- Simplify claude-hook routes, update session-state service

server/routes/claude-status.ts

@@ -3,17 +3,15 @@ import { PORT_TERMINAL } from '../config'
 
 type ClaudeStatus =
   | 'idle'
-  | 'processing'         // UserPromptSubmit - Claude is processing user input
-  | 'toolUse'            // PreToolUse - Using a tool (generic)
-  | 'toolDone'           // PostToolUse - Tool finished
-  | 'reading'            // PreToolUse(Read/Glob/Grep) - Reading files
-  | 'writing'            // PreToolUse(Edit/Write) - Writing files
-  | 'sessionStart'       // SessionStart - Session just started
-  | 'subagentStart'      // SubagentStart - Spawning subagent
-  | 'subagentStop'       // SubagentStop - Subagent finished
-  | 'notification'       // Notification - Claude sent notification
-  | 'permissionRequest'  // PermissionRequest - Waiting for user permission
-  | 'thinking'           // Legacy support
+  | 'thinking'             // UserPromptSubmit / PostToolUse - Claude is thinking
+  | 'toolUse'              // PreToolUse - Using a tool (generic)
+  | 'reading'              // PreToolUse(Read/Glob/Grep) - Reading files
+  | 'writing'              // PreToolUse(Edit/Write) - Writing files
+  | 'sessionStart'         // SessionStart - Session just started
+  | 'sessionEnd'           // SessionEnd - Session ended
+  | 'permissionRequest'    // PermissionRequest - Waiting for user permission
+  | 'interrupted'          // PostToolUseFailure with is_interrupt
+  | 'error'                // PostToolUseFailure without is_interrupt
 
 interface ClaudeStatusPayload {
   status: ClaudeStatus
@@ -28,9 +26,9 @@ export async function handleClaudeStatus(req: Request): Promise<Response | null>
     const body = await req.json() as ClaudeStatusPayload
 
     const validStatuses: ClaudeStatus[] = [
-      'idle', 'processing', 'toolUse', 'toolDone', 'reading', 'writing',
-      'sessionStart', 'subagentStart', 'subagentStop', 'notification',
-      'permissionRequest', 'thinking'
+      'idle', 'thinking', 'toolUse', 'reading', 'writing',
+      'sessionStart', 'sessionEnd', 'permissionRequest',
+      'interrupted', 'error'
     ]
     if (!body.status || !validStatuses.includes(body.status)) {
       return errorResponse(`Invalid status. Must be one of: ${validStatuses.join(', ')}`, 400)