feat: design system overhaul — sidebar, AI chats, settings, brainstorm, color cleanup

- Sidebar: dynamic brand-accent colors, brainstorm section restyled
- AI chat general: popup panel with expand/collapse, hides when contextual AI open
- AI chat contextual: tabs reordered (Actions first), X close button, height fix
- Settings: all tabs restyled, 6 new color presets (sage, terracotta, iron, etc.)
- Global color cleanup: emerald/orange hardcoded → brand-accent dynamic
- Brainstorm page: orange → brand-accent throughout
- PageEntry animation component added to key pages
- Floating AI button: bg-brand-accent instead of hardcoded black
- i18n: all 15 locales updated with new AI/billing keys
- Billing: freemium quota tracking, BYOK, stripe subscription scaffolding
- Admin: integrated into new design
- AGENTS.md + CLAUDE.md project rules added

memento-note/locales/ko.json

@@ -55,7 +55,11 @@
     "freezePinnedNotebook": "노트북 사이드바 순서 고정",
     "unfreezePinnedNotebook": "노트북 사이드바 순서 고정 해제",
     "newSubNotebook": "새 하위 노트북",
-    "renameNotebook": "이름 바꾸기"
+    "renameNotebook": "이름 바꾸기",
+    "sharedNotebookBadge": "· Shared",
+    "sortManual": "사용자 지정 순서",
+    "moveFailed": "노트북 이동 실패",
+    "dropToRoot": "여기에 놓아 루트로 이동"
   },
   "notes": {
     "title": "메모",
@@ -261,7 +265,11 @@
     "noteDeletedToast": "메모가 삭제되었습니다.",
     "deleteNoteFailedToast": "삭제할 수 없습니다.",
     "documentInfoAria": "문서정보",
-    "noModification": "변경사항 없음"
+    "noModification": "변경사항 없음",
+    "notes.emptyNotebook": "Empty notebook",
+    "notes.emptyNotebookDesc": "This notebook has no notes. Click + to create one.",
+    "notes.noNoteSelected": "No note selected",
+    "notes.selectOrCreateNote": "Select a note from the list or create a new one."
   },
   "pagination": {
     "previous": "←",
@@ -615,7 +623,14 @@
     "presentationReadyBadge": "프레젠테이션 준비 완료",
     "openInLabTitle": "실험실에서 열기",
     "inlineSummaryMarkdown": "**요약:**",
-    "networkErrorShort": "네트워크 오류입니다."
+    "networkErrorShort": "네트워크 오류입니다.",
+    "contextSourceHeading": "Context source",
+    "tones": {
+      "professional": "Professional",
+      "creative": "Creative",
+      "academic": "Academic",
+      "casual": "Casual"
+    }
   },
   "titleSuggestions": {
     "available": "제목 제안",
@@ -1415,7 +1430,10 @@
     "fontFamilyLabel": "글꼴 패밀리",
     "fontFamilyDescription": "앱 전체에서 사용할 글꼴을 선택하세요",
     "selectFontFamily": "Inter는 가독성에 최적화되어 있으며, 시스템은 OS 기본 글꼴을 사용합니다",
-    "fontSystem": "시스템 기본 글꼴"
+    "fontSystem": "시스템 기본 글꼴",
+    "fontInterDefault": "Inter (default)",
+    "fontPlayfairDisplay": "Playfair Display",
+    "fontJetBrainsMono": "JetBrains Mono"
   },
   "generalSettings": {
     "title": "일반 설정",
@@ -1744,7 +1762,27 @@
       "includeImagesHint": "Extract images from scraped pages and attach them to the generated note",
       "back": "Back",
       "configuration": "Configuration",
-      "options": "Options"
+      "options": "Options",
+      "slideThemes": {
+        "modern_wellness": "모던 앤 웰니스",
+        "business_authority": "비즈니스 앤 오서리티",
+        "nature_outdoors": "네이처 앤 아웃도어",
+        "vintage_academic": "빈티지 앤 아카데믹",
+        "soft_creative": "소프트 앤 크리에이티브",
+        "bohemian": "보헤미안",
+        "vibrant_tech": "비브런트 앤 테크",
+        "craft_artisan": "크래프트 앤 아티즌",
+        "tech_night": "테크 앤 나イト(다크)",
+        "education_charts": "교육 앤 차트",
+        "forest_eco": "포레스트 앤 에코",
+        "elegant_fashion": "엘리건트 앤 패션",
+        "art_food": "아트 앤 푸드",
+        "luxury_mystery": "럭셔리 앤 미스터리",
+        "pure_tech_blue": "퓨어 테크 블루",
+        "coastal_coral": "코스트럴 코럴",
+        "vibrant_orange_mint": "비브런트 오렌지 앤 민트",
+        "platinum_white_gold": "플래티넘 화이트 골드"
+      }
     },
     "frequencies": {
       "manual": "수동",
@@ -2033,7 +2071,19 @@
     "superscript": "어깨 기호",
     "subscript": "아래첨자",
     "addBlock": "블록 추가",
-    "placeholder": "명령에 '/'를 입력합니다..."
+    "placeholder": "명령에 '/'를 입력합니다...",
+    "aiReformulateFailed": "AI 어시스턴트가 이 텍스트를 처리하지 못했습니다. 다시 시도해 주세요.",
+    "translateTargets": {
+      "Francais": "프랑스어",
+      "English": "영어",
+      "Espanol": "스페인어",
+      "Deutsch": "독일어",
+      "Persan": "페르시아어",
+      "Portugais": "포르투갈어",
+      "Italiano": "이탈리아어",
+      "Chinois": "중국어",
+      "Japonais": "일본어"
+    }
   },
   "brainstorm": {
     "title": "Waves of Thought",
@@ -2098,6 +2148,181 @@
       "joined": "세션에 참여했습니다",
       "idea_dismissed": "아이디어를 기각했습니다",
       "invite_created": "초대장을 만들었습니다"
+    },
+    "shareDialogTitle": "Share brainstorm",
+    "shareSearchLabel": "Find someone",
+    "shareNameOrEmailPlaceholder": "Name or email…",
+    "shareSubmit": "Share",
+    "shareSubmitting": "Sending…",
+    "shareFooterHint": "They will get a notification to accept or decline.",
+    "sharePublicLink": "Public link",
+    "shareGuestsCanEdit": "Allow guests to edit",
+    "feedbackInviteSent": "Invitation sent!",
+    "feedbackInviteResent": "Invitation resent!",
+    "feedbackAlreadyShared": "This person already has access to this brainstorm.",
+    "feedbackAlreadyPending": "An invitation is already pending for this person.",
+    "feedbackGenericError": "Error",
+    "unnamedPerson": "No name",
+    "canvasEditTitleReply": "Reply",
+    "canvasEditTitleNewIdea": "New idea",
+    "canvasPlaceholderReply": "Your reply…",
+    "canvasPlaceholderIdea": "Your idea…",
+    "canvasShortcutSave": "save",
+    "canvasShortcutCancel": "cancel",
+    "canvasChildBranch": "Child",
+    "canvasDoubleClickHint": "Double-click to add an idea",
+    "ideaDetailDescription": "Description",
+    "ideaDetailConnection": "Connection",
+    "ideaDetailNovelty": "Novelty",
+    "ideaDetailWave": "Wave",
+    "waveFlavorVariation": "Variation",
+    "waveFlavorAnalogy": "Analogy",
+    "waveFlavorDisruption": "Disruption",
+    "liveCollaborationTitle": "Live collaboration",
+    "liveStatus": "Live",
+    "liveYouMarker": "(You)",
+    "liveOtherParticipants": "{count} other participants",
+    "guestReadOnlyNotice": "You're viewing this brainstorm as a guest. Sign in to edit.",
+    "impactNotesEnriched": "{count} note(s) enriched",
+    "impactNotesMarkedDry": "{count} note(s) marked dry",
+    "impactSeparator": " · ",
+    "exportNotebookPrefix": "Notebook:",
+    "playbackStep": "Step {current}/{total}",
+    "playbackStepsCount": "{count} steps",
+    "playbackReturnToLive": "Return to live",
+    "canvasWaitingHint": "The canvas is waiting for your spark...",
+    "seedNodeBadge": "SEED",
+    "originalSeedDescription": "Original seed idea",
+    "convertedToNoteStatus": "Converted to note",
+    "toastExpandSuccess": "Ideas expanded!",
+    "toastExpandFailed": "Failed to expand",
+    "toastDismissSuccess": "Idea dismissed",
+    "toastDismissFailed": "Failed to dismiss",
+    "toastConvertSuccess": "Idea converted to note!",
+    "toastConvertFailed": "Failed to convert",
+    "toastExportNoteSuccess": "Exported as note!",
+    "toastExportFailed": "Failed to export",
+    "legendSeed": "Seed",
+    "legendVariations": "Variations",
+    "legendAnalogies": "Analogies",
+    "legendDisruptions": "Disruptions",
+    "exportFailedMessage": "Export failed",
+    "exportDefaultNotebookName": "Brainstorm",
+    "exportDefaultNoteTitle": "Synthesis",
+    "exportOpening": "Opening…",
+    "ownerBadge": "Owner",
+    "waveBadge": "Wave {wave}"
+  },
+  "usageMeter": {
+    "packName": "AI Discovery Pack",
+    "featureSearch": "Search",
+    "featureTags": "Tags",
+    "featureTitles": "Titles",
+    "unlimited": "Unlimited",
+    "remaining": "{count} left",
+    "upgradeTitle": "Upgrade to Pro",
+    "upgradeDescription": "You've used all your AI Discovery Pack credits. Upgrade to Pro for higher limits and additional features.",
+    "proIncludes": "Pro includes:",
+    "proSearch": "100 semantic searches / month",
+    "proTags": "200 auto-tags / month",
+    "proTitles": "200 auto-titles / month",
+    "proReformulate": "50 reformulations / month",
+    "proChat": "100 chat messages / month",
+    "later": "Later",
+    "upgradePricing": "Upgrade to Pro",
+    "addApiKey": "Use your own API key (BYOK)"
+  },
+  "byokSettings": {
+    "title": "Your API keys (BYOK)",
+    "description": "Connect your own LLM provider keys to bypass Discovery Pack quotas. Keys are encrypted at rest.",
+    "badgeActive": "BYOK active",
+    "tierRequired": "BYOK requires a Pro plan or higher. Upgrade to connect your API keys.",
+    "provider": "Provider",
+    "providerPlaceholder": "Select a provider",
+    "alias": "Label (optional)",
+    "aliasPlaceholder": "e.g. Work OpenAI",
+    "apiKey": "API key",
+    "apiKeyPlaceholder": "sk-...",
+    "save": "Save key",
+    "saved": "API key saved",
+    "deleted": "API key removed",
+    "error": "Could not save API key",
+    "loadError": "Could not load API keys",
+    "loading": "Loading keys...",
+    "empty": "No API keys configured yet.",
+    "confirmDelete": "Remove this API key permanently?",
+    "toggleActive": "Active",
+    "providers": {
+      "openai": "OpenAI",
+      "anthropic": "Anthropic",
+      "deepseek": "DeepSeek",
+      "openrouter": "OpenRouter",
+      "minimax": "MiniMax",
+      "zai": "Z.ai",
+      "google": "Google",
+      "mistral": "Mistral",
+      "glm": "GLM"
     }
+  },
+  "billing": {
+    "title": "결제",
+    "currentPlan": "현재 플랜",
+    "upgradePlan": "플랜 업그레이드",
+    "manageBilling": "결제 관리",
+    "manageDescription": "결제 수단 업데이트, 청구서 보기 또는 취소.",
+    "openPortal": "결제 포털 열기",
+    "renewsOn": "갱신일",
+    "expiresOn": "만료일",
+    "canceledAt": "취소됨 — 접근 만료",
+    "freePlan": "무료 플랜",
+    "proPlan": "Pro 플랜",
+    "businessPlan": "Business 플랜",
+    "enterprisePlan": "Enterprise 플랜",
+    "perMonth": "/월",
+    "perYear": "/년",
+    "monthly": "월간",
+    "annual": "연간",
+    "save": "절약",
+    "upgradeTitle": "플랜 선택",
+    "proPrice": "€9.90",
+    "businessPrice": "€29.90",
+    "proAnnualPrice": "€99",
+    "businessAnnualPrice": "€299",
+    "proFeature1": "시맨틱 검색 100회/월",
+    "proFeature2": "자동 태그 200회/월",
+    "proFeature3": "재구성 50회/월",
+    "proFeature4": "채팅 메시지 100개/월",
+    "businessFeature1": "시맨틱 검색 1,000회/월",
+    "businessFeature2": "자동 태그 1,000회/월",
+    "businessFeature3": "재구성 500회/월",
+    "businessFeature4": "채팅 메시지 1,000개/월",
+    "enterpriseTitle": "Enterprise",
+    "enterpriseDescription": "사용자 정의 할당량, SSO, 우선 지원.",
+    "contactSales": "영업 문의",
+    "startCheckout": "시작하기",
+    "checkoutLoading": "결제 로딩 중…",
+    "checkoutSuccess": "구독이 활성화되었습니다! {tier}에 오신 것을 환영합니다.",
+    "checkoutCanceled": "결제가 취소되었습니다.",
+    "active": "활성",
+    "trialing": "체험 중",
+    "pastDue": "연체",
+    "canceled": "취소됨",
+    "inactive": "비활성",
+    "billingEnabled": "결제 활성화됨",
+    "billingDisabled": "이 인스턴스에서는 결제가 활성화되지 않았습니다.",
+    "usageThisPeriod": "이번 기간 사용량",
+    "periodRange": "기간",
+    "unlimited": "무제한",
+    "noUsage": "사용 데이터 없음",
+    "billingHistory": "청구 내역",
+    "viewInvoices": "포털에서 청구서 관리",
+    "nextBillingDate": "다음 청구일",
+    "billingPeriod": "청구 기간",
+    "planSince": "가입일",
+    "checkoutSuccessTitle": "구독 활성화!",
+    "checkoutSuccessBody": "{tier}에 오신 것을 환영합니다.",
+    "subscriptionType": "subscriptionType",
+    "renewalDate": "renewalDate",
+    "noRenewalDate": "—"
   }
-}
+}