feat(tui): personal TUI rework, integrating upstream model reasoning-effort selection

Consolidates the personal dsh-tui customizations (module split into
components/session/extension, prompt template + running-glyph indicator,
copyable transcript, tool-card headers, timing placement, XML tool output,
status/footer rework) and ports upstream's model reasoning-effort selector
(Shift+Tab effort cycling, effort-aware /model, footer, and /status) onto
the personal module layout.

packages/ui/tui/tests/snapshots/question-dialog.expected.txt

@@ -8,17 +8,14 @@ viewport
   style 10-16 bold
 1| " Snapshot agent ready."
   style 1-21 fg=bright-black
-2| " deepseek-v4-flash  •  main-session"
-  style 1-34 dim
-3| "────────────────────────────────────────────────────────"
-  style 0-55 dim
-4| "                                                        "
-  style 1-1 inverse
-5| "────────────────────────────────────────────────────────"
-  style 0-55 dim
-6| "deepseek-v4-flash  /workspace/project  ↑0 ↓0  0% context"
-  style 0-43 dim
-  style 46-55 dim
+2| " main-session"
+  style 1-12 dim
+3| <blank>
+4| "Assistant                                               "
+  style 0-8 fg=bright-magenta bold underline
+5| "Model wait 0.0s                                         "
+  style 0-14 dim
+6| <blank>
 7| "                                                        "
 8| "  Question 1/3 (3 unanswered) · Coverage                "
   style 2-39 fg=bright-black