chore: add pre-commit and pre-push git hooks for format and lint

.githooks/pre-commit

@@ -0,0 +1,34 @@
+#!/bin/sh
+# Pre-commit hook: auto-format and lint the project with Biome.
+# Aborts the commit if unfixable lint errors remain after auto-fix.
+
+STAGED=$(git diff --cached --name-only --diff-filter=ACMR | grep -E '\.(ts|js|json|html)$')
+
+if [ -z "$STAGED" ]; then
+  exit 0
+fi
+
+echo "Running Biome fix on staged files..."
+
+# Run biome fix on staged files only (using node_modules binary so npm scripts are not needed)
+BIOME="./node_modules/.bin/biome"
+if [ ! -x "$BIOME" ]; then
+  echo "Biome not found in node_modules. Run 'npm install' first."
+  exit 1
+fi
+
+echo "$STAGED" | xargs "$BIOME" check --write --no-errors-on-unmatched
+
+STATUS=$?
+
+# Re-stage the files that were originally staged (biome may have modified them)
+echo "$STAGED" | xargs git add
+
+if [ $STATUS -ne 0 ]; then
+  echo ""
+  echo "Biome reported errors that could not be auto-fixed."
+  echo "Please fix the issues above and try committing again."
+  exit 1
+fi
+
+exit 0

.githooks/pre-push

@@ -0,0 +1,34 @@
+#!/bin/sh
+# Pre-push hook: run full lint and type-check before pushing.
+# Blocks the push if there are lint errors or type errors.
+
+BIOME="./node_modules/.bin/biome"
+TSC="./node_modules/.bin/tsc"
+
+if [ ! -x "$BIOME" ] || [ ! -x "$TSC" ]; then
+  echo "Required tools not found in node_modules. Run 'npm install' first."
+  exit 1
+fi
+
+echo "Running Biome lint check..."
+"$BIOME" lint .
+LINT_STATUS=$?
+
+if [ $LINT_STATUS -ne 0 ]; then
+  echo ""
+  echo "Lint errors found. Run 'npm run fix' to auto-fix, then commit and push again."
+  exit 1
+fi
+
+echo "Running TypeScript type check..."
+"$TSC" --noEmit
+TSC_STATUS=$?
+
+if [ $TSC_STATUS -ne 0 ]; then
+  echo ""
+  echo "TypeScript errors found. Fix the errors above before pushing."
+  exit 1
+fi
+
+echo "All checks passed."
+exit 0

package.json

@@ -16,7 +16,8 @@
     "watch": "tsc --watch",
     "clean": "rm -rf dist",
     "generate-svg-icon": "tsx scripts/bouncingBallToSVG.ts",
-    "icons": "npm run generate-svg-icon && tsx scripts/generate-icons.ts"
+    "icons": "npm run generate-svg-icon && tsx scripts/generate-icons.ts",
+    "prepare": "git config core.hooksPath .githooks"
   },
   "dependencies": {
     "@ffmpeg/core": "^0.12.10",