ui: round 6 — Enter submits from anywhere; model dashes ACTUALLY kept; dumbbell right

- ENTER SUBMITS REGARDLESS OF FOCUS (owner): dictation means the dock
  fields are rarely focused. New useEnterSubmits hook — a window-level
  listener inside both docks (mounted only while a problem/question is
  active). Plain Enter anywhere outside a typing surface submits the
  practice thinking / the teaching answer; typing surfaces keep their
  own handlers, buttons keep their click-activation (the collapsed
  Problem bar still expands on Enter), modified Enters untouched.
  Teaching sessions get the same law as practice — one standard.
- MODEL DASHES: the round-5 join("-") edit never landed (the batch
  script aborted on an earlier assert before reaching it) — the source
  still joined with spaces while the commit message claimed otherwise.
  Now actually joined with dashes: 'glm-5.3-flash' everywhere (picker,
  setup dialog, stats bar); pins updated to match.
- SIDEBAR: the practice dumbbell moves to the far right of the session
  row — titles sit flush with teaching rows, cleaner list.

components/question-dock.tsx

@@ -4,6 +4,7 @@ import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { ArrowDownIcon, ChevronRightIcon, PlayIcon } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { finishDictation, isDictationActive, joinDictation, useDictationTarget } from "@/components/dictation";
+import { useEnterSubmits } from "@/components/enter-submits";
 import { MessageResponse } from "@/components/ai-elements/message";
 import { cn } from "@/lib/utils";
 import {
@@ -367,6 +368,11 @@ function QuestionDockForm({
 		onSubmit(buildAnswer(qd, req));
 	};
 
+	/* ENTER SUBMITS FROM ANYWHERE (owner round 6, 2026-10-05): the same
+	 * law as the practice dock — dictated answers rarely focus the field.
+	 * Rides submit() so the dictation-flush law is shared, not forked. */
+	useEnterSubmits(submit);
+
 	// Selecting Other never clears the thinking field — two channels, the
 	// answer and the reasoning behind it, side by side.
 	const selectOther = () => setSel(toggleOther(selectMode, sel));