feat(web): code-block word-wrap + per-code-block and per-turn copy buttons

Operator UX asks on the web console:
- Code blocks now WRAP (`white-space: pre-wrap; overflow-wrap: anywhere`) instead of
  overflowing with a horizontal scrollbar — a long unbreakable token wraps in place.
- Per-code-block copy button (hover-revealed, top-right of each `.md-code-wrap`).
- Per-turn copy button (in the live turn-rule; top-right on seeded/historical turns) —
  copies the turn's response text; the existing think-inline copy is unchanged.

One delegated click handler on #tw covers both (works across live / historical / think
renders where blocks are injected via innerHTML). `copyText` falls back to a hidden
textarea + execCommand when `navigator.clipboard` is absent (plain-http LAN context),
and buttons flash "✓ copied". Static file served from disk — a browser refresh picks it
up, no :8765 restart. Playwright-verified: code wraps (no x-overflow), both buttons copy
the right text; 90 web tests green.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "ratatoskr"
-version = "0.20.15"
+version = "0.20.16"
 description = "Worldtree Conversation API debug TUI — multi-pane observability dashboard"
 readme = "README.md"
 requires-python = ">=3.12"

uv.lock

@@ -1052,7 +1052,7 @@ wheels = [
 
 [[package]]
 name = "ratatoskr"
-version = "0.20.15"
+version = "0.20.16"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },