chore: upgrade ESLint 8→9, migrate to flat config#42
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- Upgrade eslint ^8→^9, eslint-plugin-vue ^8→^10, @vue/eslint-config-prettier ^9→^10 - Add globals, vue-eslint-parser as direct devDependencies (required by pnpm strict resolution) - Replace eslintConfig in package.json and src/.eslintrc.js with eslint.config.mjs (flat config) - Switch to flat/vue2-essential config preset (Vue 2 project) - Update lint script: drop --ext flag (removed in ESLint 9), use eslint src directly - Silence vue/no-reserved-component-names for Header component (rename is separate task) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…tensions option to ESLint 9 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
eslint^8 → ^9,eslint-plugin-vue^8 → ^10,@vue/eslint-config-prettier^9 → ^10eslintConfiginpackage.jsonandsrc/.eslintrc.jswitheslint.config.mjs(ESLint 9 flat config format)vue-eslint-parserandglobalsas direct devDependencies (required by pnpm's strict package isolation)flat/vue2-essentialpreset (correct preset for a Vue 2 project)--extflag was removed in ESLint 9, changed toeslint srcvue/no-reserved-component-namesforHeadercomponent — renaming is a separate follow-up taskTest plan
pnpm lintpasses with no errorspnpm buildcompiles without issues🤖 Generated with Claude Code