feat(ui): SPEC-V0-3-0-PANE-WIRE-001 MS-1 — pane action handlers wire (ClosePane / FocusNext/Prev carry from Sprint 1)

[GoosLab]

Summary

v0.3.0 Sprint 2 #5 — carry chain 종결. Sprint 1 의 MENU-WIRE-001 #100 이 5 stub 을 follow-up 으로 carry 한 뒤 #107 (Surface×3) 가 처리했고, 본 PR 이 마지막 묶음 인 Pane×3 (ClosePane / FocusNextPane / FocusPrevPane) 을 functional 로 변환한다.

• lib.rs:2191~2199 의 3 info!("...deferred") stub → 실제 PaneTree 동작 호출
• 신규 helper: close_focused_pane / focus_next_pane / focus_prev_pane (cx-bound, RootView)
• 신규 cx-free helper: next_focus_in_leaves / prev_focus_in_leaves (wrap-around) + route_pane_command_to_kind (dispatch_command routing)
• dispatch_command 의 pane.close / pane.focus_next / pane.focus_prev 분기 활성, 알 수 없는 pane.* 는 false 반환
• palette/registry.rs 의 pane.close entry 는 이미 존재 (확인 후 추가 불필요)

Testing

• 신규 unit tests +8 (T-PW 블록): wrap-around / single leaf / orphan fallback / unknown-id 검증
• ui crate 1355 → 1363 PASS, 회귀 0 (additive only)
• 3-gate: cargo fmt / cargo clippy -D warnings / cargo test --lib ALL PASS
• LSP errors: 0

SPEC

• .moai/specs/SPEC-V0-3-0-PANE-WIRE-001/spec.md (lightweight, 8 ACs, MS-1)
• AC-PW-1~8 모두 PASS

Related

• Carry-from: SPEC-V0-3-0-MENU-WIRE-001 §6 carry-to "Pane SPEC", SPEC-V0-1-2-MENUS-001 §3.1
• Sibling: SPEC-V0-3-0-SURFACE-MENU-WIRE-001 (feat(ui): SPEC-V0-3-0-SURFACE-MENU-WIRE-001 MS-1 — Surface×3 functional wire (carry from MENU-WIRE-001) #107, OPEN at PR creation)
• Carry-to: 없음 — Sprint 2 carry chain 종결

Test plan

• cargo fmt --all PASS
• cargo clippy -p moai-studio-ui --all-targets -- -D warnings PASS (0 warnings)
• cargo test -p moai-studio-ui --lib PASS (1363 passed)
• CI required contexts (7) 동기 검증 (auto-merge armed)
• feat(ui): SPEC-V0-3-0-SURFACE-MENU-WIRE-001 MS-1 — Surface×3 functional wire (carry from MENU-WIRE-001) #107 머지 후 conflict 검사 (lib.rs 인접 hunk; conflict 시 수동 rebase 필요)

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