feat(workflow): exclude text-capable nodes with connected text from send targets

CLIP Text Encode and friends whose text widget is backed by a connected
input cannot have their text changed via the widget (execution reads the
linked input), so sending to them was a silent no-op.

- Registry: compute text_widget_connected capability from the widget's
  backing input link state; has_text_widget drops to false when wired;
  include the flag in the registration fingerprint so link changes
  re-register the affected nodes
- Registry: hook link connect/disconnect (graph events on new litegraph,
  onAfterChange fallback for classic) on root and subgraphs, plus
  subgraph-created for future subgraphs
- applyWidgetUpdate: skip inject_text when the target widget is connected
  and self-heal the registry instead of writing a value that is ignored
- Web UI: drop text_widget_connected nodes from prompt/embedding send
  candidates; show a Mark as -> Send Prompt Target hint toast when no
  candidates remain (new uiHelpers.workflow.noPromptTargets key, synced
  to all locales; zh-CN/zh-TW translated)
- Extract shared resolveTextWidget() used by both the candidate-set
  logic and the write path so the two cannot drift apart
- Tests: workflow registry connection-state registration, subgraph
  handling, fingerprint re-registration, inject_text write/skip paths,
  setup link-change hooks; uiHelpers candidate filtering and hint toast

web/comfyui/utils.js

@@ -36,7 +36,11 @@ function isMapLike(collection) {
     return collection && typeof collection.entries === "function" && typeof collection.values === "function";
 }
 
-function getChildGraphs(graph) {
+/**
+ * Return the subgraph LGraph instances nested under `graph`, across both
+ * Map-like and plain-object `_subgraphs` containers.
+ */
+export function getChildGraphs(graph) {
     if (!graph || !graph._subgraphs) {
         return [];
     }