feat(ui): add roadblock reply field to the ROADBLOCK card

A task that reports a roadblock but finishes successfully (Done/WaitingForReview/
Failed/Cancelled) had no way to answer it short of a full reset-and-rerun, losing
the run's context. Adds a reply textbox + Send button to the existing ROADBLOCK
card, modeled on the AskUser question card, that resumes the session via
ContinueTaskAsync with the user's own text. Gated on LatestRunSessionId (disabled
with a hint when there's nothing to resume); failures surface through the footer
error strip instead of a modal.

src/ClaudeDo.Localization/locales/de.json

@@ -215,6 +215,12 @@
     "prepTitle": "Tagesvorbereitung",
     "planDay": "Tag planen",
     "prepEmpty": "Heute noch keine Vorbereitung — klick Tag planen",
+    "roadblockReply": {
+      "placeholder": "Auf den Roadblock antworten…",
+      "send": "Senden",
+      "noSession": "Keine Sitzung zum Fortsetzen — dieser Lauf hat keine Session-ID zum Antworten.",
+      "failed": "Antwort konnte nicht gesendet werden: {0}"
+    },
     "attachments": {
       "sectionLabel": "ANHÄNGE",
       "dropToAttach": "Zum Anhängen ablegen",