perf(sessions): scope preview-tab refresh to items a chat tool touched

[Guilhem-lm]

Summary

After a chat round, the sessions page reloaded preview tabs based on a broad mutating-tool name regex (/^(write_|patch_|delete_|deploy_|discard_|set_|create_|update_|remove_)/) with a reload-all fallback: any matching tool without a resolvable args.path set pendingReloadAll, blank-rebooting every preview iframe in every warm session. The frequent offender was update_user_instructions (the AI's "remember this" tool — no path), so casually saving a preference rebooted every open preview. create_folder did the same.

This replaces the regex + fallback with an explicit allowlist that maps a completed tool call to the (kind, path) of the item it touched. Item editor iframes (script/flow/app) now reload only when that exact item changed — kind-aware, so a script edit never reboots a same-path flow/app tab. Non-item list pages (runs, schedules, …) still reload on any workspace mutation, so they stay fresh. A tool that changes no workspace state (update_user_instructions) reloads nothing.

The allowlist also picks up edit_script, init_app, and rebase_draft — real mutators whose names the old regex silently missed, so they never reloaded before.

No visible UI change — this only changes when preview iframes reload.

Changes

• frontend/src/routes/(root)/(logged)/sessions/+page.svelte:
  • toolReloadEffect(name, args) → { scopes, reloadPages }: the single source of truth for what a tool reloads. Item mutations yield a (kind, path) scope; non-item workspace mutations (write_schedule/write_resource/write_variable/write_trigger/create_folder) yield reloadPages: true only; everything else (incl. update_user_instructions) reloads nothing.
  • reloadTabs(scopes, reloadPages): item-route iframes reload only when their (kind, path) is in scope; non-item page tabs reload when reloadPages; live-editor slots still self-skip in PreviewTabHost.reload().
  • Dropped the pendingReloadAll "reload everything" fallback.

Test plan

Verified in a real browser (dev server, ai-meta-e2e workspace) by tagging a preview iframe's contentWindow with a sentinel and running real chat rounds:

• update_user_instructions ("remember I prefer dark mode") → sentinel survives (no reload). Previously reloaded every tab.
• write_script (draft script) → item/page reload fires (sentinel cleared).
• write_variable (non-item workspace mutation) → page tab reloads (sentinel cleared) — list pages stay fresh.
• npm run check:fast clean; sessions page + AI chat + preview panel mount with no console errors from the change.
• Reviewer sanity: open a script and a raw-app in two preview tabs, edit each via chat, confirm only the touched tab's iframe reloads.

🤖 Generated with Claude Code

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[Guilhem-lm]

Superseded by #10006, which now carries both the scoped preview-refresh change (this PR's commit is its base) and the multi-target live-editor work as a single PR.