🎨 Palette: [UX 개선] NetworkGraph 접근성 개선

[seonghobae]

💡 무엇을: NetworkGraph 컴포넌트의 그래프 확대, 전체 화면 맞춤 버튼에 title과 aria-label을 추가하고 첫 관계 보기 버튼에 title을 추가했습니다.
🎯 왜: 아이콘만 있는 버튼의 접근성을 높이고 스크린 리더 사용자와 키보드 탐색 사용자에게 더 명확한 컨텍스트를 제공하기 위해서입니다.
📸 변경 전/후: (변경 전) 아이콘만 있는 버튼 (변경 후) 호버 시 툴팁이 표시되고 스크린 리더에서 버튼의 목적을 읽을 수 있음.
♿ 접근성: WCAG 지침에 따라 모든 버튼에 식별 가능한 이름과 툴팁이 제공됩니다.

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PR created automatically by Jules for task 18400674092159870237 started by @seonghobae

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Reviewing files that changed from the base of the PR and between 042b0c7 and 0b3afb8.

📒 Files selected for processing (2)

• frontend/src/components/NetworkGraph.test.tsx
• frontend/src/components/NetworkGraph.tsx

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[seonghobae]

Fresh comparison against protected develop@042b0c70531b229af3acbd0421a2f23098d848b3 and open #1500 shows no unique valid accessibility delta remains here. 그래프 확대 and 전체 그래프 맞춤 are already text buttons, so their visible text already supplies the accessible name; duplicating it into aria-label and native title does not add a missing semantic contract. For 첫 관계 보기, this PR removes pointer-events-none from a still-native-disabled button merely to attach a native title; #1500 owns the stronger repair: a focusable fail-closed aria-disabled control, aria-describedby relationship, visible role=tooltip explanation on hover/focus, and real keyboard-sequence Playwright coverage. Keeping this PR would create a weaker competing implementation on the same lines. Closing under the permitted no-valid-delta / fully-superseded condition, with #1500 retaining the executable accessibility evidence. No check/review evidence transfers.

[google-labs-jules]

Fresh comparison against protected develop@042b0c70531b229af3acbd0421a2f23098d848b3 and open #1500 shows no unique valid accessibility delta remains here. 그래프 확대 and 전체 그래프 맞춤 are already text buttons, so their visible text already supplies the accessible name; duplicating it into aria-label and native title does not add a missing semantic contract. For 첫 관계 보기, this PR removes pointer-events-none from a still-native-disabled button merely to attach a native title; #1500 owns the stronger repair: a focusable fail-closed aria-disabled control, aria-describedby relationship, visible role=tooltip explanation on hover/focus, and real keyboard-sequence Playwright coverage. Keeping this PR would create a weaker competing implementation on the same lines. Closing under the permitted no-valid-delta / fully-superseded condition, with #1500 retaining the executable accessibility evidence. No check/review evidence transfers.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.