토큰 카드와 전송 버튼 외곽선 정리

- AX Agent 입력 영역의 토큰 사용량 원형 카드 크기와 내부 링 두께를 재조정
- 토큰 카드 임계점 마커와 퍼센트 텍스트를 축소해 외곽선이 덜 답답하게 보이도록 보정
- 전송 버튼의 불필요한 외곽 테두리를 제거하고 화살표 정렬을 중앙 기준으로 정리
- README와 DEVELOPMENT 문서에 버튼/토큰 UI 미세 조정 이력 추가
- 검증: dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\verify\ -p:IntermediateOutputPath=obj\verify\ (경고 0, 오류 0)

docs/DEVELOPMENT.md

@@ -1,5 +1,6 @@
 # AX Copilot - 媛쒕컻 臾몄꽌
 
+- Document update: 2026-04-06 20:05 (KST) - Refined the AX Agent composer token indicator and send button surface. The context-usage circle now uses a roomier 32px shell with thinner ring strokes and a smaller threshold marker for a cleaner outline, while the send button now drops its redundant outer border and uses a more precisely centered arrow glyph.
 - Document update: 2026-04-06 19:56 (KST) - Fine-tuned the AX Agent top tab vertical centering. The shared TopTabBtn style now uses explicit centered content alignment plus slightly reduced wrapper/button padding and height so 채팅 / Cowork / 코드 sit more evenly within the segmented control.
 - Document update: 2026-04-06 19:46 (KST) - Renamed the AX Agent `Claw` preset label to `Claude` while keeping `claw` as a backward-compatible stored value alias. New settings default to `claude`, and old saved values are normalized on load.
 - Document update: 2026-04-06 19:46 (KST) - Re-tuned theme palettes against real-world references: `AgentClawDark/Light/System` now follow Claude-like warm neutrals more closely, `AgentCodexDark` now matches the neutral charcoal reference more closely, `AgentNordLight/Dark/System` use the official Nord palette values, and `AgentSlateLight/Dark/System` were normalized toward a more canonical slate UI range.
@@ -5016,3 +5017,4 @@ ow + toggle ?쒓컖 ?몄뼱濡??ㅼ떆 ?뺣젹?덈떎.
 - Document update: 2026-04-06 18:34 (KST) - Reduced the per-keystroke hot-path cost of the global keyboard hook. `InputListener.cs` now performs the suppressed-foreground-window check only when the current key could actually trigger the launcher hotkey, the capture hotkey, or a registered key filter, instead of doing the window-class lookup on every keydown.
 - Document update: 2026-04-06 18:34 (KST) - `SnippetExpander.cs` now short-circuits immediately for normal typing unless snippet tracking is already active or the current key is the `;` trigger. This removes repeated `GetAsyncKeyState` and buffer logic from ordinary typing in other apps and makes the low-level hook substantially lighter under continuous input.
 
+