fix(web): keep for-each dive-in clickable for running items

[Vigneshwar (vigneshwarKV)]

Problem

In the web dashboard's for-each group detail panel, each row under ITEMS has a stacked-layers "Dive into subworkflow" control. Clicking it navigates into the iteration's nested workflow — but only when the item is COMPLETED or FAILED. While an item is RUNNING, clicking the icon does nothing.

Root cause

The dive-in control was a <span role="button">nested inside the row's expand/collapse <button>:

<buttononClick={...toggle...}disabled={!hasDetails}>
...chevron / key / metrics / status badge...
{canDiveIn&&(<spanrole="button"onClick={(e)=>{e.stopPropagation();navigateIntoSubworkflow(...)}}><Layers/></span>)}</button>

The outer toggle is disabled={!hasDetails}, where hasDetails = prompt || output != null || activity?.length || error_type. A running workflow-type iteration hasn't produced any of those yet (its prompt/output/activity live on the child SubworkflowContext, not on the for-each item), so hasDetails is false and the outer button is disabled.

A disabled <button> suppresses click events across its entire subtree, so the nested dive-in span never received the click. Once the item failed (the for_each_item_failed event carries an error_type) or completed, hasDetails flipped to true, the button was enabled, and dive-in worked — exactly matching the "only navigates when FAILED" symptom.

The store's navigateIntoSubworkflow and the SubworkflowContext for the running iteration were both fine (the context exists as soon as subworkflow_started fires, so the icon correctly renders for running items) — the click simply never reached the handler.

Fix

Restructure the header row so the expand/collapse toggle and the dive-in control are siblings inside a plain flex <div>, instead of nesting an interactive element inside a (sometimes disabled) button. The dive-in is now a real <button>, so it:

• stays clickable regardless of the toggle's disabled state,
• gets native keyboard/focus behavior (dropping the manual role/tabIndex/onKeyDown/stopPropagation shim), and
• no longer produces invalid nested-interactive-element markup.

Only GroupDetail.tsx changed behaviorally; the static/ bundle is the rebuilt frontend (make build-frontend).

Verification

Reproduced against a real for-each fan-out (two concurrent workflow-type iterations): before the change, the dive-in icon was inert on the RUNNING row and worked on the FAILED row; after the change it navigates into the nested workflow in both states. tsc -b (via make build-frontend) passes.

[Vigneshwar (vigneshwarKV)]

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=======================================
Coverage ? 89.03% =======================================
Files ? 69 Lines ? 12281 Branches ? 0 =======================================
Hits ? 10934 Misses ? 1347 Partials ? 0 

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[Jason Robert (jrob5756)]

Approving. Validated the root cause and fix end-to-end, plus a multi-agent review (code quality, tests, comments, dead code, simplification): the dive-in is correctly un-nested from the disabled toggle so it stays clickable for running for-each items. Improves a11y (native button), removes invalid nested-interactive markup and the manual keydown/stopPropagation shim, passes tsc -b, and the rebuilt bundle is byte-identical. Only optional nits remain (aria-label, type="button" on the toggle, a frontend test-harness follow-up).