fix(16): resolve 3 UAT issues — update flow, batch cancel, text commands

- Fix update sub-workflow: remove unsupported GraphQL filter arg, fix node
  reference (Format Pull Error → Format Update Error), fix field case
  (data.image → data.Image)
- Fix batch cancel: connect Route Callback output 20 (batchcancel) to
  Prepare Batch UI Input (was empty connection array)
- Fix text commands: change .item.json to .first().json for paired item
  breakage after GraphQL chain expansion; convert Send Batch Confirmation
  from Telegram node to HTTP Request to fix double-serialized reply_markup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/debug/batch-cancel-broken.md

@@ -0,0 +1,67 @@
+---
+status: verifying
+trigger: "The cancel button on the batch confirmation dialog does not work"
+created: 2026-02-09T00:00:00Z
+updated: 2026-02-09T00:02:00Z
+---
+
+## Current Focus
+
+hypothesis: CONFIRMED - Route Callback output index 20 (batchcancel) had empty connection array
+test: fix applied and pushed to n8n (HTTP 200)
+expecting: batch cancel button now routes to Prepare Batch UI Input -> Batch UI sub-workflow -> Handle Cancel
+next_action: user verification - press cancel button on batch confirmation dialog in Telegram
+
+## Symptoms
+
+expected: Cancel button on batch confirmation dialog should cancel the operation and return user to previous state
+actual: Cancel button does nothing (callback is parsed but routed to empty connection)
+errors: No error in n8n - execution silently ends because route goes nowhere
+reproduction: select containers in batch, confirm selection, press cancel on confirmation dialog
+started: after Phase 16 migration (Docker socket proxy -> Unraid GraphQL API)
+
+## Eliminated
+
+## Evidence
+
+- timestamp: 2026-02-09T00:00:30Z
+  checked: Parse Callback Data node in n8n-workflow.json (line 558)
+  found: batch:cancel callback is correctly parsed, sets isBatchCancel=true
+  implication: callback parsing is working correctly
+
+- timestamp: 2026-02-09T00:00:40Z
+  checked: Route Callback switch node outputs (lines 569-1094)
+  found: isBatchCancel is output index 20 (outputKey "batchcancel"), the LAST output
+  implication: routing rule exists and should match correctly
+
+- timestamp: 2026-02-09T00:00:50Z
+  checked: Route Callback connection array (lines 5495-5638)
+  found: Output index 20 is empty array [] (line 5637) while outputs 14-19 all connect to "Prepare Batch UI Input"
+  implication: ROOT CAUSE - batch:cancel callback is parsed and routed but the output goes nowhere
+
+- timestamp: 2026-02-09T00:00:55Z
+  checked: Prepare Batch UI Input node (line 3420)
+  found: Node explicitly handles isBatchCancel -> sets action='cancel', and Batch UI sub-workflow has cancel route
+  implication: The downstream handling exists and is correct - only the connection is missing
+
+- timestamp: 2026-02-09T00:01:00Z
+  checked: Batch UI sub-workflow cancel route (n8n-batch-ui.json line 564-576)
+  found: Handle Cancel node returns {action:'cancel', chatId, messageId, queryId, answerText:'Batch selection cancelled'}
+  implication: Sub-workflow cancel handling is complete - just needs to be reached
+
+- timestamp: 2026-02-09T00:01:00Z
+  checked: batch:cancel callback sources
+  found: Used in 3 places: (1) batch selection UI cancel button, (2) batch stop confirmation cancel button, (3) text-command batch confirmation cancel button
+  implication: This broken connection affects ALL batch cancel scenarios, not just one dialog
+
+- timestamp: 2026-02-09T00:02:00Z
+  checked: Fix applied - connected output 20 to "Prepare Batch UI Input"
+  found: JSON validated, workflow pushed to n8n successfully (HTTP 200)
+  implication: Fix is deployed - needs user verification via Telegram
+
+## Resolution
+
+root_cause: Route Callback switch node output index 20 (batchcancel) had empty connection array [] instead of connecting to "Prepare Batch UI Input" like all other batch-related outputs (indices 14-19). This was likely a wiring oversight during Phase 16 migration when batch operations were added to the Route Callback switch - the batchcancel rule was added last but its connection was left empty.
+fix: Connected Route Callback output index 20 (batchcancel) to "Prepare Batch UI Input" node, matching the pattern of outputs 14-19 (bexecTextCmd, batchmode, batchtoggle, batchnav, batchexec, batchclear)
+verification: Fix applied and pushed to n8n (HTTP 200). JSON validated. Awaiting user Telegram verification.
+files_changed: [n8n-workflow.json]