v2026.10.03 fix(theme-list): restore copy buttons on redesigned themes page

[junaidkbr]

Summary

Shopify's themes page redesign broke the theme list utilities: the ID and Preview URL copy buttons stopped appearing, on page refresh and after client-side navigation.

Theme list copy buttons (654a126)

• The redesign removed the ThemeListItem class and s-internal-context-provider the script relied on, and Canvas themes link to /themes/:id/canvas instead of /editor. Items are now found via ul[class*="ThemeList"] > li, and the theme ID is parsed from any /themes/:id link.
• The buttons are tertiary s-internal-buttons with clipboard icons, on their own row below the theme's actions. The actions row already wraps, so a full-width row drops below it without moving React's nodes. contain: inline-size keeps the row from widening the actions container, and a hidden, inert clone of the more-actions button lines the copy buttons up under "Edit theme". At 831px and below, where Shopify stacks the actions under the theme, the row aligns left and drops the spacer.
• The themes page is a client-side-routed iframe, so setup now re-checks the path on wxt:locationchange and starts or stops its observer to match.
• If React re-renders an item and drops the buttons, the next scan adds them back.

Dev script (50c1be5)

• bun run dev started the changelog watcher in the background with nothing to stop it, so every wxt exit (failed Chrome launches included) left one running. A trap now kills it on exit, and the script still exits with wxt's exit code. watch:changelog is inlined, since nothing else used it.

Docs (639c2e3)

• AGENTS.md trimmed to project-specific facts, with new notes on the Online Store iframe and on the Chrome for Testing profile version. CLAUDE.md (a one-line @AGENTS.md import) removed.

Test plan

• bun test (748 pass), typecheck, lint, format:check, svelte-check
• New entrypoints/theme-customizer.content/tests/theme-list.test.ts, built on markup captured from the live themes page (Canvas and editor themes, re-injection, spacer)
• Manually verified on the themes page in the dev build: buttons render below the actions, aligned under "Edit theme", and at ≤831px
• bun run dev then Ctrl+C: the watcher, wxt and Chrome all exit