Move panel temporary state to worker OPFS

coverage/xyzac-panel-button-parity.report.json

@@ -160,6 +160,35 @@
     "screenshot_sha256": "dbf6d196cec3fe765a64d5a1d194b7ebb5681a30555f238e084c9ad6deac6032",
     "status_detail": "WASM startup, file/package load, POWER, HOME, RESET, switchkins, views, clear plot, MANUAL/MDI, XYZAC JOG, spindle/brake, coolant, tool/probe, overrides, MDI, RUN/PAUSE/RESUME/ABORT/STEP, startup sequence, editor Load/Reopen and ABI-disabled gates all verified"
   },
+  "opfs_ui_cache": {
+    "schema": "linuxcnc-ui-temp-json.v1",
+    "storage_owner": "dedicated-worker",
+    "cnc_authority": "linuxcnc-wasm-only",
+    "commands": ["UI_STATE_SAVE", "UI_STATE_LOAD", "UI_STATE_CLEAR"],
+    "features": ["double_slot", "generation", "saved_at_ttl", "state_hash", "record_hash", "corruption_fallback", "size_limit"],
+    "power_off_checkpoint": "opfs_temp_json_v1",
+    "tests": {
+      "state": "node web/worker/test_opfs_ui_state.mjs",
+      "bridge": "node web/worker/test_opfs_worker_bridge.mjs",
+      "status": "verified"
+    },
+    "browser_oracle": "pending_real_quota_crash_reload_offline_matrix",
+    "published_browser_probe": {
+      "command": "node scripts/test_xyzac_opfs_browser.mjs",
+      "release": "20260903-linuxcnc-wasm-opfs-r30",
+      "status": "verified",
+      "view_before": "z",
+      "view_after_reload": "z",
+      "right_tab_before": "DRO",
+      "right_tab_after_reload": "DRO",
+      "selected_axis_after_reload": "A",
+      "opfs_files": ["linuxcnc-web-wasm/ui-state/xyzac-trt/state-b.json", "linuxcnc-web-wasm/ui-state/xyzac-trt/manifest.json"],
+      "local_storage_keys_before": 0,
+      "local_storage_keys_after": 0,
+      "browser_errors": 0,
+      "screenshot": "/tmp/xyzac-opfs-browser.png"
+    }
+  },
   "release_status": "STOP_RELEASE",
   "scope_gaps": [
     "override_limits_command",