fix(office-ui): native progress parity, ui_state lock hardening, approval-card idempotency

Native agent progress panel (company mode):
- ws_handler: filter runtime bookkeeping noise (turn/status/member_inbox_updated),
  keep tool_completed as tool_call, thinking summary previews content,
  preserve raw thinking_delta fragments (no strip; skip whitespace-only)
- frontend progressLog: summarize thinking by content preview; merge thinking
  by detail only so the 'Thinking' label never splices into text
- AgentProgressBlock: add bottom "Show more (N earlier steps)" toggle

ui_state.db "database is locked" hardening:
- ws_handler: isolate engine progress/kanban/runtime-event callbacks so UI
  persistence failures never crash work items
- chat_store: busy_timeout, _retry_locked backoff, idempotent insert_message
  (INSERT OR REPLACE), create_channel read-before-write to stop poll writes
- server: flock single-instance guard for `opc ui` per OPC home

Approval card duplicate-click bug:
- EscalationPanel: disable buttons on click with Submitting state and 30s
  reconnect fallback
- ws_handler: stale-escalation branch checks real card status (new
  chat_store.get_checkpoint_message); already-resolved cards get an accurate
  "already handled (decision: X)" reply without being re-marked stale;
  dedup identical helper messages within 120s to stop reply spam

Company mode prompt:
- add soft guidance that the runtime monitors state and re-activates roles,
  so leaders need not poll work items after delegation/review

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

opc/plugins/office_ui/frontend_src/chat/EscalationPanel.tsx

@@ -1,7 +1,11 @@
-import React, { useCallback, useMemo } from 'react'
+import React, { useCallback, useEffect, useMemo, useState } from 'react'
 import type { ChatMessageMeta, HumanEscalationOption } from '../types/chat'
 import { MarkdownBody } from './MarkdownBody'
 
+// If the server never confirms (click lost on a dropped connection), re-enable
+// the buttons after this long so the user can retry.
+const SUBMIT_CONFIRM_TIMEOUT_MS = 30000
+
 interface EscalationPanelProps {
   meta: ChatMessageMeta
   onReply: (text: string) => void
@@ -57,10 +61,20 @@ export const EscalationPanel = React.memo(function EscalationPanel({
   const worktreePath = String(meta.worktree_path ?? '').trim()
   const hasRuntimeState = activeSubagents.length > 0 || permissionRequests.length > 0 || !!worktreePath
 
+  const [submittedOptionId, setSubmittedOptionId] = useState('')
+  const isSubmitting = !!submittedOptionId && !isResponded
+
+  useEffect(() => {
+    if (!isSubmitting) return
+    const timer = window.setTimeout(() => setSubmittedOptionId(''), SUBMIT_CONFIRM_TIMEOUT_MS)
+    return () => window.clearTimeout(timer)
+  }, [isSubmitting, submittedOptionId])
+
   const handleReply = useCallback((option: HumanEscalationOption) => {
-    if (isResponded) return
+    if (isResponded || isSubmitting) return
+    setSubmittedOptionId(option.id)
     onReply(option.label || option.id)
-  }, [isResponded, onReply])
+  }, [isResponded, isSubmitting, onReply])
 
   return (
     <div className="ckpt-panel ckpt-escalation">
@@ -109,15 +123,22 @@ export const EscalationPanel = React.memo(function EscalationPanel({
           {options.map((option) => (
             <button
               key={option.id}
-              className={`ckpt-btn ${option.id.includes('deny') ? 'ckpt-btn-deny' : 'ckpt-btn-approve'}`}
+              className={`ckpt-btn ${option.id.includes('deny') ? 'ckpt-btn-deny' : 'ckpt-btn-approve'}${isSubmitting ? ' ckpt-btn-submitting' : ''}`}
               onClick={() => handleReply(option)}
+              disabled={isSubmitting}
             >
-              {option.label || option.id}
+              {isSubmitting && submittedOptionId === option.id ? 'Submitting…' : (option.label || option.id)}
             </button>
           ))}
         </div>
       )}
 
+      {isSubmitting && (
+        <div className="ckpt-escalation-hint">
+          Decision sent — waiting for server confirmation…
+        </div>
+      )}
+
       {!isResponded && meta.default_action && (
         <div className="ckpt-escalation-hint">
           Default on timeout: <code>{meta.default_action}</code>