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/ru.json

@@ -55,7 +55,11 @@
     "freezePinnedNotebook": "Закрепить порядок на боковой панели блокнота",
     "unfreezePinnedNotebook": "Открепить порядок боковой панели блокнота",
     "newSubNotebook": "Новый субноутбук",
-    "renameNotebook": "Переименовать"
+    "renameNotebook": "Переименовать",
+    "sharedNotebookBadge": "· Shared",
+    "sortManual": "Свободный порядок",
+    "moveFailed": "Не удалось переместить блокнот",
+    "dropToRoot": "Перетащите сюда для перемещения в корень"
   },
   "notes": {
     "title": "Заметки",
@@ -261,7 +265,11 @@
     "noteDeletedToast": "Примечание удалено.",
     "deleteNoteFailedToast": "Не удалось удалить.",
     "documentInfoAria": "Информация о документе",
-    "noModification": "Никаких изменений"
+    "noModification": "Никаких изменений",
+    "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": "Презентация готова",
     "openInLabTitle": "Открыть в лаборатории",
     "inlineSummaryMarkdown": "**Краткое содержание:**",
-    "networkErrorShort": "Ошибка сети."
+    "networkErrorShort": "Ошибка сети.",
+    "contextSourceHeading": "Context source",
+    "tones": {
+      "professional": "Professional",
+      "creative": "Creative",
+      "academic": "Academic",
+      "casual": "Casual"
+    }
   },
   "titleSuggestions": {
     "available": "Предложения заголовков",
@@ -1415,7 +1430,10 @@
     "fontFamilyLabel": "Семейство шрифтов",
     "fontFamilyDescription": "Выберите шрифт, используемый во всём приложении",
     "selectFontFamily": "Inter оптимизирован для читаемости, Системный использует нативный шрифт вашей ОС",
-    "fontSystem": "Системный шрифт по умолчанию"
+    "fontSystem": "Системный шрифт по умолчанию",
+    "fontInterDefault": "Inter (default)",
+    "fontPlayfairDisplay": "Playfair Display",
+    "fontJetBrainsMono": "JetBrains Mono"
   },
   "generalSettings": {
     "title": "Общие настройки",
@@ -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": "Современность и велнес",
+        "business_authority": "Бизнес и авторитет",
+        "nature_outdoors": "Природа и активный отдых",
+        "vintage_academic": "Винтаж и академизм",
+        "soft_creative": "Мягкость и креатив",
+        "bohemian": "Богемный",
+        "vibrant_tech": "Яркость и техно",
+        "craft_artisan": "Ремесло",
+        "tech_night": "Техно и ночь (тёмный)",
+        "education_charts": "Образование и графики",
+        "forest_eco": "Лес и эко",
+        "elegant_fashion": "Элегантность и мода",
+        "art_food": "Искусство и гастрономия",
+        "luxury_mystery": "Роскошь и тайна",
+        "pure_tech_blue": "Чистый техно-синий",
+        "coastal_coral": "Прибрежный коралл",
+        "vibrant_orange_mint": "Яркий оранжевый и мята",
+        "platinum_white_gold": "Платина и белое золото"
+      }
     },
     "frequencies": {
       "manual": "Вручную",
@@ -2033,7 +2071,19 @@
     "superscript": "Надстрочный индекс",
     "subscript": "Индекс",
     "addBlock": "Добавить блок",
-    "placeholder": "Введите '/' для команд..."
+    "placeholder": "Введите '/' для команд...",
+    "aiReformulateFailed": "ИИ-помощник не смог обработать этот текст. Попробуйте снова.",
+    "translateTargets": {
+      "Francais": "Французский",
+      "English": "Английский",
+      "Espanol": "Испанский",
+      "Deutsch": "Немецкий",
+      "Persan": "Персидский",
+      "Portugais": "Португальский",
+      "Italiano": "Итальянский",
+      "Chinois": "Китайский",
+      "Japonais": "Японский"
+    }
   },
   "brainstorm": {
     "title": "Waves of Thought",
@@ -2098,6 +2148,181 @@
       "joined": "присоединился к сессии",
       "idea_dismissed": "отказался от идеи",
       "invite_created": "создал приглашение"
+    },
+    "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": "Оплата",
+    "currentPlan": "Текущий план",
+    "upgradePlan": "Обновить план",
+    "manageBilling": "Управление оплатой",
+    "manageDescription": "Обновить способ оплаты, посмотреть счета или отменить.",
+    "openPortal": "Открыть портал оплаты",
+    "renewsOn": "Обновляется",
+    "expiresOn": "Истекает",
+    "canceledAt": "Отменено — доступ до",
+    "freePlan": "Бесплатный план",
+    "proPlan": "План Pro",
+    "businessPlan": "План Business",
+    "enterprisePlan": "План Enterprise",
+    "perMonth": "/мес",
+    "perYear": "/год",
+    "monthly": "Ежемесячно",
+    "annual": "Ежегодно",
+    "save": "Экономия",
+    "upgradeTitle": "Выбрать план",
+    "proPrice": "9,90 €",
+    "businessPrice": "29,90 €",
+    "proAnnualPrice": "99 €",
+    "businessAnnualPrice": "299 €",
+    "proFeature1": "100 семантических поисков / месяц",
+    "proFeature2": "200 авто-тегов / месяц",
+    "proFeature3": "50 перефразирований / месяц",
+    "proFeature4": "100 сообщений чата / месяц",
+    "businessFeature1": "1 000 семантических поисков / месяц",
+    "businessFeature2": "1 000 авто-тегов / месяц",
+    "businessFeature3": "500 перефразирований / месяц",
+    "businessFeature4": "1 000 сообщений чата / месяц",
+    "enterpriseTitle": "Enterprise",
+    "enterpriseDescription": "Пользовательские квоты, SSO, приоритетная поддержка.",
+    "contactSales": "Связаться с продажами",
+    "startCheckout": "Начать",
+    "checkoutLoading": "Загрузка оплаты…",
+    "checkoutSuccess": "Подписка активирована! Добро пожаловать в {tier}.",
+    "checkoutCanceled": "Оплата отменена.",
+    "active": "Активный",
+    "trialing": "Пробный",
+    "pastDue": "Просроченный",
+    "canceled": "Отменён",
+    "inactive": "Неактивный",
+    "billingEnabled": "Оплата включена",
+    "billingDisabled": "Оплата не включена в этом экземпляре.",
+    "usageThisPeriod": "Использование за период",
+    "periodRange": "Период",
+    "unlimited": "Без ограничений",
+    "noUsage": "Нет данных об использовании",
+    "billingHistory": "История платежей",
+    "viewInvoices": "Управление счетами в портале",
+    "nextBillingDate": "Следующая дата выставления счёта",
+    "billingPeriod": "Расчётный период",
+    "planSince": "Участник с",
+    "checkoutSuccessTitle": "Подписка активирована!",
+    "checkoutSuccessBody": "Добро пожаловать в {tier}. Ваши функции теперь доступны.",
+    "subscriptionType": "subscriptionType",
+    "renewalDate": "renewalDate",
+    "noRenewalDate": "—"
   }
-}
+}