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/lib/progressLog.test.ts

@@ -28,9 +28,41 @@ for (const [seq, detail] of [
 }
 
 assert.equal(log.length, 1)
-assert.equal(log[0]?.summary, 'Thinking')
+assert.equal(log[0]?.summary, '我先联网抓取')
 assert.equal(log[0]?.detail, '我先联网抓取')
 
+// Token-sized streaming fragments keep their whitespace when merged, and
+// entries without detail never splice their summary label into the text.
+let spacedLog = appendProgressEntry([], {
+  timestamp: 100,
+  type: 'thinking',
+  summary: 'The user',
+  detail: 'The user',
+  turnId: 'rt-2:1',
+  itemId: 'rt-2:1:thinking',
+  seq: 1,
+})
+spacedLog = appendProgressEntry(spacedLog, {
+  timestamp: 101,
+  type: 'thinking',
+  summary: 'wants to',
+  detail: ' wants to',
+  turnId: 'rt-2:1',
+  itemId: 'rt-2:1:thinking',
+  seq: 2,
+})
+spacedLog = appendProgressEntry(spacedLog, {
+  timestamp: 102,
+  type: 'thinking',
+  summary: 'Thinking',
+  turnId: 'rt-2:1',
+  itemId: 'rt-2:1:thinking',
+  seq: 3,
+})
+assert.equal(spacedLog.length, 1)
+assert.equal(spacedLog[0]?.detail, 'The user wants to')
+assert.equal(spacedLog[0]?.summary, 'The user wants to')
+
 const unchanged = appendProgressEntry(log, {
   timestamp: 5,
   type: 'thinking',