test(frontend): stabilize async coverage orchestration

[seonghobae]

Summary

• wait for project and diagram rows before opening snapshots or enabling fake timers
• wait for selected-project snapshot data before asserting search branches
• prove the first project metadata requests started, then switch projects before rejecting them so the stale-response guard is tested deterministically

Current-head failure evidence

This base stabilization addresses repeated frontend/src/App.coverage.test.tsx failures observed on dependency/feature PR current heads:

• PR 🎨 Palette: [UX improvement] 다이얼로그의 범용 동작 버튼에 명확한 aria-label 추가 #517, coverage-evidence job 86712253543: shows terminal refresh failures from the polling loop could not find the 열기 button; ignores stale project metadata failures after changing projects leaked a stale error.
• PR chore(deps): bump github/codeql-action/analyze from 4.36.2 to 4.37.0 #542, frontend job 86711733107: navigates dashboard, project, and diagram states including empty/search branches asserted 검색 결과가 없습니다. before snapshots loaded.
• PR 🎨 Palette: [UX improvement] Add unique aria-labels to dynamic column inputs in EditTableModal #556, coverage-evidence job 86711954091: preserves positions across graph refresh and applies recommendations with sibling nodes could not find the 열기 button.

The failures are base-owned asynchronous test races, so this PR fixes the shared base once rather than duplicating the same patch across dependency branches.

Validation

• RED reproduced on main: navigates dashboard... failed at line 328 with the pre-load empty state.
• focused test repeated three times: 17/17 passed each run.
• latest-base focused test: 17/17 passed.
• full frontend coverage: 25 files, 183 tests passed; statements 1400/1400, branches 1052/1052, functions 315/315, lines 1260/1260 (all 100%).
• production build: passed.
• git diff --check: passed.
• CodeGraph initialized before analysis and synchronized after the edit.

Local coverage validation used --testTimeout=10000 because this workstation has Node 24 while the repository declares Node >=26 <27; no timeout or coverage policy was weakened in the repository.

This is test-only stabilization, so no academic-paper artifact is applicable.

[opencode-agent]

OpenCode Review Overview

• Head SHA: 2d4ec3b8776b4f76f3185bae3ad15786ecdf5228
• Workflow run: 29216912110
• Workflow attempt: 1
• Gate result: APPROVE (approval step)

Pull request overview

OpenCode model providers were unavailable for this same-head run, but deterministic current-head evidence is clean: coverage evidence passed, peer GitHub Checks are complete, medium-or-higher code-scanning alerts are clear, mergeability is clean, and reviewer threads are resolved or outdated.

Findings

No blocking findings.

Evidence

• Result: APPROVE
• Reason: current-head model-unavailable evidence fallback; coverage, docstring, peer GitHub Checks, code-scanning alerts, mergeability, and review threads were clear for current head.
• Scope: unsupported
• Changed files: 0
• Model-pool outcome: exhausted
• Head SHA: 2d4ec3b8776b4f76f3185bae3ad15786ecdf5228
• Workflow run: 29216912110
• Workflow attempt: 1

This fallback does not suppress failed checks, medium-or-higher code-scanning alerts, merge conflicts, unresolved reviewer threads, or failed coverage evidence; any of those conditions still publish REQUEST_CHANGES or leave the approval state unchanged.

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Frontend: App.coverage.test.tsx"]
  S1 --> I1["browser runtime and bundle"]
  I1 --> R1["Review risk: Frontend: App.coverage.test.tsx"]
  R1 --> V1["frontend tests"]

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[opencode-agent]

Pull request overview

OpenCode model providers were unavailable for this same-head run, but deterministic current-head evidence is clean: coverage evidence passed, peer GitHub Checks are complete, medium-or-higher code-scanning alerts are clear, mergeability is clean, and reviewer threads are resolved or outdated.

Findings

No blocking findings.

Evidence

• Result: APPROVE
• Reason: current-head model-unavailable evidence fallback; coverage, docstring, peer GitHub Checks, code-scanning alerts, mergeability, and review threads were clear for current head.
• Scope: unsupported
• Changed files: 0
• Model-pool outcome: exhausted
• Head SHA: 77285025bef148c47c5e77bfafb96a63dc957a50
• Workflow run: 29217320229
• Workflow attempt: 1

This fallback does not suppress failed checks, medium-or-higher code-scanning alerts, merge conflicts, unresolved reviewer threads, or failed coverage evidence; any of those conditions still publish REQUEST_CHANGES or leave the approval state unchanged.

[opencode-agent]

Pull request overview

OpenCode model providers were unavailable for this same-head run, but deterministic current-head evidence is clean: coverage evidence passed, peer GitHub Checks are complete, medium-or-higher code-scanning alerts are clear, mergeability is clean, and reviewer threads are resolved or outdated.

Findings

No blocking findings.

Evidence

• Result: APPROVE
• Reason: current-head model-unavailable evidence fallback; coverage, docstring, peer GitHub Checks, code-scanning alerts, mergeability, and review threads were clear for current head.
• Scope: unsupported
• Changed files: 0
• Model-pool outcome: exhausted
• Head SHA: 2a3201e585923ec63af56e4e9e61f880351024e5
• Workflow run: 29219876480
• Workflow attempt: 1

This fallback does not suppress failed checks, medium-or-higher code-scanning alerts, merge conflicts, unresolved reviewer threads, or failed coverage evidence; any of those conditions still publish REQUEST_CHANGES or leave the approval state unchanged.