Studio: add HTML artifacts to chat (#5772)

* Studio: add chat HTML artifact primitives

* Studio: add local render_html tool support

* Studio: wire render_html artifacts in chat UI

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Studio: add chat artifact surface

* Studio: mount chat artifact panel and overlay

* Studio: fix chat artifact review regressions

* Studio: fix chat artifact panel and sandbox previews

* Studio: address chat artifact review follow-ups

* Studio: polish chat artifact UI affordances

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Studio: scope artifact IDs by message to prevent cross-turn collisions

* Studio: fix artifact panel for local threads and surface tool errors

* Studio: restrict artifact frame embedding to same-origin

* Studio: stop local chat thread remount loop

* Studio: fix chat artifact store cleanup regressions

* Studio: shim artifact preview storage in sandbox

* feat(chat): add artifact rendering controls

* fix(chat): show artifact progress during tool calls

* fix(chat): refine artifact preview behavior

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix(chat): ignore tool markers inside arguments

* feat(chat): polish artifact preview panel

* fix(chat): stabilize artifact panel behavior

* fix(inference): merge duplicate Anthropic tool starts

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>