feat: add growth tracking page and related functionality

- Implemented a new Growth page to track practice time and trends.
- Added API integration for fetching review data.
- Created components for displaying practice statistics and trends.
- Updated navigation titles for the main index and growth pages.
- Removed unused styles from the index page.
- Introduced a Projects management page for adding and editing practice projects.
- Developed a Record form for logging practice sessions with validation.
- Added utility functions for date manipulation and duration formatting.
- Implemented error handling and session management in the practice service.
- Created unit tests for the practice service to ensure reliability.

backend/scripts/test-integration.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+set -eu
+
+backend_dir=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+cd "$backend_dir"
+
+# A supplied test database must permit isolated CREATE SCHEMA. Tests never use
+# PG* application settings or touch existing tables; every test owns its schema.
+if [ -n "${TEST_DATABASE_URL:-}" ]; then
+  REQUIRE_TEST_DATABASE=1 go test -race ./...
+  exit
+fi
+
+# Disposable memory-backed database, loopback only, no existing Compose volumes.
+test_container=$(docker run --detach --rm --publish 127.0.0.1::5432 \
+  --env POSTGRES_USER=ballet_test --env POSTGRES_PASSWORD=local-isolated-test \
+  --env POSTGRES_DB=ballet_test --tmpfs /var/lib/postgresql postgres:18-alpine)
+trap 'docker stop "$test_container" >/dev/null' EXIT HUP INT TERM
+attempt=0
+until docker exec "$test_container" pg_isready -U ballet_test -d ballet_test >/dev/null 2>&1; do
+  attempt=$((attempt + 1))
+  if [ "$attempt" -ge 30 ]; then printf '%s\n' 'Test PostgreSQL did not become ready.' >&2; exit 1; fi
+  sleep 1
+done
+test_port=$(docker port "$test_container" 5432 | sed 's/.*://')
+TEST_DATABASE_URL="postgres://ballet_test:local-isolated-test@127.0.0.1:$test_port/ballet_test?sslmode=disable" \
+  REQUIRE_TEST_DATABASE=1 go test -race ./...