fix(render): offer the Aside remedy only on macOS (#3735); fix docs/skills.md vision-model line (#3375) (#4131)

* fix(render): offer the Aside remedy only on macOS (#3735)

NO_BROWSER_HELP told Linux and Windows hosts to open the Aside app, which
ships only for macOS. noBrowserHelp(platform) now adds the Aside remedy on
darwin only and keeps the ./setup and GSTACK_BROWSE_BIN remedies everywhere.
Also corrects docs/skills.md's /design-html refinement loop, which still said
"Uses GPT-4o vision", to match the design-html template (#3375).

Rewritten on main from outside PR #4122.

Co-authored-by: szsunyuan <3579304+szsunyuan@users.noreply.github.com>
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* chore(changelog): name the #3735 fragment after the branch

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

---------

Co-authored-by: szsunyuan <3579304+szsunyuan@users.noreply.github.com>
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

docs/skills.md

@@ -467,7 +467,7 @@ Not every page needs the full Pretext engine. The skill reads the design and pic
 ### The refinement loop
 
 1. Reads the approved mockup from `approved.json`, plus any page archetype and section outline you picked on the board, which it builds as given instead of asking again
-2. Uses GPT-4o vision to extract implementation spec (colors, typography, layout)
+2. Extracts an implementation spec (colors, typography, layout) with the provider's vision model (OpenAI gpt-5.5, or Gemini when only a Gemini key is set; `GSTACK_DESIGN_MODEL` overrides)
 3. Generates self-contained HTML with Pretext inlined (15KB, zero network dependency)
 4. Spins up a live-reload server so you see changes instantly
 5. Screenshots at 3 viewports (mobile, tablet, desktop) to verify layout