chore(deps): upgrade major dependencies (ESLint 10, recharts 3, TS 6, Vite 8) (#130)

* chore(deps): upgrade ESLint 9 → 10 with plugin compatibility fixes

- eslint: ^9 → ^10.0.0 (backend + frontend)
- @eslint/js: ^9 → ^10.0.0 (backend + frontend)
- eslint-plugin-react-refresh: ^0.4.24 → ^0.5.2 (ESM, config factory API)
- Update frontend eslint.config.js: destructured import for react-refresh,
  call configs.vite() as factory function (0.5 API change)
- Downgrade new ESLint 10 rules (no-useless-assignment, preserve-caught-error)
  to warnings for existing code patterns
- eslint-plugin-react-hooks stays at 7.0.1 (stable) with --legacy-peer-deps
  until a stable release adds ESLint 10 peer support

* chore(deps): upgrade recharts 2.x to 3.8 with chart.tsx type fixes

recharts 3.x moved Tooltip/Legend props to context-based API.
Updated chart.tsx to use explicit prop interfaces with internal
recharts type imports (LegendPayload, TooltipPayload, TooltipFormatter).

* chore(deps): upgrade TypeScript 5.9 to 6.0

- Remove deprecated baseUrl from frontend tsconfig (paths works standalone in TS 6)
- Add react-is dependency required by recharts 3.x at build time
- Backend and frontend both compile and lint cleanly

* chore(deps): upgrade Vite 7.3 to 8.0 and @vitejs/plugin-react to 6.0

Vite 8 replaces Rollup+esbuild with Rolldown, significantly improving
build speed (~2s vs ~18s). No config changes required.

* fix(ci): add .npmrc with legacy-peer-deps for CI and Docker builds

typescript-eslint@8.x requires typescript <6.0.0 and
eslint-plugin-react-hooks@7.0.1 requires eslint <=9. Until upstream
packages release compatible versions, legacy-peer-deps is needed.

* docs: add logo assets and re-ignore CLAUDE.md

* fix(ci): copy .npmrc into prod-deps Docker stage

The prod-deps stage also runs npm ci with backend/package.json but was
missing the .npmrc needed to bypass peer dep conflicts.

.gitignore

@@ -44,6 +44,7 @@ npm-debug.log*
 # Claude Code
 .claude/
 plans/
+CLAUDE.md
 
 # Playwright MCP
 .playwright-mcp/

Dockerfile

@@ -9,7 +9,7 @@ FROM --platform=$BUILDPLATFORM node:20-alpine AS frontend-builder
 
 WORKDIR /app/frontend
 
-COPY frontend/package*.json ./
+COPY frontend/package*.json frontend/.npmrc ./
 RUN npm config set fetch-retry-maxtimeout 120000 && \
     npm config set fetch-retries 5 && \
     npm install
@@ -25,7 +25,7 @@ WORKDIR /app/backend
 
 RUN apk add --no-cache python3 make g++
 
-COPY backend/package*.json ./
+COPY backend/package*.json backend/.npmrc ./
 RUN npm config set fetch-retry-maxtimeout 120000 && \
     npm config set fetch-retries 5 && \
     npm install
@@ -69,7 +69,7 @@ RUN if [ "$TARGETARCH" = "$BUILDARCH" ]; then \
       xx-apk add --no-cache g++ musl-dev linux-headers; \
     fi
 
-COPY backend/package*.json ./
+COPY backend/package*.json backend/.npmrc ./
 
 # Native: plain npm ci — g++ compiles native modules for the host arch.
 # Cross:  npm_config_arch tells prebuild-install/node-pre-gyp which pre-built

backend/.npmrc

@@ -0,0 +1 @@
+legacy-peer-deps=true

backend/eslint.config.mjs

@@ -22,6 +22,9 @@ export default tseslint.config(
       // Terminal output processing intentionally uses control characters in regexes
       'no-control-regex': 'off',
       'no-console': 'off',
+      // New in ESLint 10 recommended — existing patterns, suppress until addressed
+      'no-useless-assignment': 'warn',
+      'preserve-caught-error': 'warn',
     },
   },
 )

backend/package.json

@@ -15,6 +15,7 @@
   "license": "ISC",
   "type": "commonjs",
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@types/bcrypt": "^6.0.0",
     "@types/better-sqlite3": "^7.6.13",
     "@types/cookie-parser": "^1.4.10",
@@ -23,14 +24,13 @@
     "@types/node": "^25.3.0",
     "@types/supertest": "^7.2.0",
     "@types/yaml": "^1.9.6",
+    "eslint": "^10.1.0",
     "nodemon": "^3.1.13",
     "supertest": "^7.2.2",
     "ts-node": "^10.9.2",
-    "typescript": "^5.9.3",
-    "vitest": "^4.1.0",
-    "@eslint/js": "^9.0.0",
-    "eslint": "^9.0.0",
-    "typescript-eslint": "^8.0.0"
+    "typescript": "^6.0.2",
+    "typescript-eslint": "^8.0.0",
+    "vitest": "^4.1.0"
   },
   "dependencies": {
     "@types/cors": "^2.8.19",

frontend/.npmrc

@@ -0,0 +1 @@
+legacy-peer-deps=true

frontend/eslint.config.js

@@ -1,7 +1,7 @@
 import js from '@eslint/js'
 import globals from 'globals'
 import reactHooks from 'eslint-plugin-react-hooks'
-import reactRefresh from 'eslint-plugin-react-refresh'
+import { reactRefresh } from 'eslint-plugin-react-refresh'
 import tseslint from 'typescript-eslint'
 import { defineConfig, globalIgnores } from 'eslint/config'
 
@@ -13,7 +13,7 @@ export default defineConfig([
       js.configs.recommended,
       tseslint.configs.recommended,
       reactHooks.configs.flat.recommended,
-      reactRefresh.configs.vite,
+      reactRefresh.configs.vite(),
     ],
     languageOptions: {
       ecmaVersion: 2020,

frontend/package.json

@@ -41,8 +41,9 @@
     "radix-ui": "^1.4.3",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
+    "react-is": "^19.2.4",
     "react-use-measure": "^2.1.7",
-    "recharts": "^2.15.4",
+    "recharts": "^3.8.0",
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.5.0",
     "tailwindcss-animate": "^1.0.7",
@@ -50,19 +51,19 @@
     "xterm-addon-serialize": "^0.11.0"
   },
   "devDependencies": {
-    "@eslint/js": "^9.39.1",
+    "@eslint/js": "^10.0.1",
     "@tailwindcss/vite": "^4.2.2",
     "@types/node": "^25.5.0",
     "@types/react": "^19.2.7",
     "@types/react-dom": "^19.2.3",
-    "@vitejs/plugin-react": "^5.1.1",
-    "eslint": "^9.39.1",
+    "@vitejs/plugin-react": "^6.0.1",
+    "eslint": "^10.1.0",
     "eslint-plugin-react-hooks": "^7.0.1",
-    "eslint-plugin-react-refresh": "^0.4.24",
+    "eslint-plugin-react-refresh": "^0.5.2",
     "globals": "^17.4.0",
     "tailwindcss": "^4.2.2",
-    "typescript": "~5.9.3",
+    "typescript": "^6.0.2",
     "typescript-eslint": "^8.48.0",
-    "vite": "^7.3.1"
+    "vite": "^8.0.2"
   }
 }

frontend/src/components/ui/chart.tsx

@@ -1,5 +1,12 @@
 import * as React from "react"
 import * as RechartsPrimitive from "recharts"
+import type { LegendPayload } from "recharts/types/component/DefaultLegendContent"
+import type {
+  NameType,
+  ValueType,
+  Payload as TooltipPayload,
+  Formatter as TooltipFormatter,
+} from "recharts/types/component/DefaultTooltipContent"
 
 import { cn } from "@/lib/utils"
 
@@ -102,14 +109,20 @@ const ChartTooltip = RechartsPrimitive.Tooltip
 
 const ChartTooltipContent = React.forwardRef<
   HTMLDivElement,
-  React.ComponentProps<typeof RechartsPrimitive.Tooltip> &
-    React.ComponentProps<"div"> & {
-      hideLabel?: boolean
-      hideIndicator?: boolean
-      indicator?: "line" | "dot" | "dashed"
-      nameKey?: string
-      labelKey?: string
-    }
+  React.ComponentProps<"div"> & {
+    active?: boolean
+    payload?: TooltipPayload<ValueType, NameType>[]
+    label?: string | number
+    labelFormatter?: (label: string | number, payload: TooltipPayload<ValueType, NameType>[]) => React.ReactNode
+    labelClassName?: string
+    formatter?: TooltipFormatter<ValueType, NameType>
+    color?: string
+    hideLabel?: boolean
+    hideIndicator?: boolean
+    indicator?: "line" | "dot" | "dashed"
+    nameKey?: string
+    labelKey?: string
+  }
 >(
   (
     {
@@ -147,7 +160,7 @@ const ChartTooltipContent = React.forwardRef<
       if (labelFormatter) {
         return (
           <div className={cn("font-medium", labelClassName)}>
-            {labelFormatter(value, payload)}
+            {labelFormatter(value as string | number, payload!)}
           </div>
         )
       }
@@ -192,7 +205,7 @@ const ChartTooltipContent = React.forwardRef<
 
               return (
                 <div
-                  key={item.dataKey}
+                  key={String(item.dataKey)}
                   className={cn(
                     "flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5 [&>svg]:text-muted-foreground",
                     indicator === "dot" && "items-center"
@@ -260,11 +273,12 @@ const ChartLegend = RechartsPrimitive.Legend
 
 const ChartLegendContent = React.forwardRef<
   HTMLDivElement,
-  React.ComponentProps<"div"> &
-    Pick<RechartsPrimitive.LegendProps, "payload" | "verticalAlign"> & {
-      hideIcon?: boolean
-      nameKey?: string
-    }
+  React.ComponentProps<"div"> & {
+    payload?: LegendPayload[]
+    verticalAlign?: "top" | "bottom" | "middle"
+    hideIcon?: boolean
+    nameKey?: string
+  }
 >(
   (
     { className, hideIcon = false, payload, verticalAlign = "bottom", nameKey },

frontend/tsconfig.app.json

@@ -24,7 +24,6 @@
     "noFallthroughCasesInSwitch": true,
     "noUncheckedSideEffectImports": true,
 
-    "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
     }

frontend/tsconfig.json

@@ -1,6 +1,5 @@
 {
   "compilerOptions": {
-    "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
     }