chore: add Biome for lint and fix all lint errors
- Install @biomejs/biome as devDependency at root - Configure biome.json with 2-space indent, double quotes, Tailwind CSS support - Add lint/lint:fix/format/format:fix scripts to root and app package.json - Fix noNonNullAssertion: env vars extracted to variables with suppression, <div role=button> replaced with <button> - Fix noUnusedVariables: remove unused destructured vars - Fix useIterableCallbackReturn: arrow functions with block body - Fix noExplicitAny: recharts Tooltip formatters - Fix noLabelWithoutControl: add htmlFor+id or use <span> for non-input labels - Fix noStaticElementInteractions/useKeyWithClickEvents: role+keyboard events for overlays - Fix noArrayIndexKey: use error string as key - Fix CSS parse: enable tailwindDirectives parser - Normalize formatting across 80 files with biome check --write
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