feat: sync all BRAIN mobile changes - onboarding, cookies, legal, mobile UX, settings

- Add OnboardingWizard, BetaBanner, CookieBanner components
- Add legal pages (Privacy, Terms, Cookies)
- Update Layout with mobile topbar, sidebar drawer, plan banner
- Update SettingsPage with profile, API config, security
- Update CharacterForm with topic suggestions, niche chips
- Update EditorialCalendar with shared strategy card
- Update ContentPage with narrative technique + brief
- Update SocialAccounts with 4 platforms and token guides
- Fix CSS button color inheritance, mobile responsive
- Add backup script
- Update .gitignore for pgdata and backups

Co-Authored-By: Claude (BRAIN/StackOS) <noreply@anthropic.com>

backup.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -euo pipefail
+
+BACKUP_DIR="/opt/lab-leopost-full-prod/backups"
+FNAME="leopost_$(date +%Y%m%d_%H%M).sql.gz"
+GDRIVE_DIR="gdrive:Backups/Leopost"
+LOG="$BACKUP_DIR/backup.log"
+RETENTION_DAYS=7
+
+log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" | tee -a "$LOG"; }
+
+log "--- Avvio backup $FNAME ---"
+
+# 1. pg_dump → gzip
+docker exec prod-leopost-postgres pg_dump -U leopost leopost | gzip > "$BACKUP_DIR/$FNAME"
+SIZE=$(du -sh "$BACKUP_DIR/$FNAME" | cut -f1)
+log "Dump creato: $FNAME ($SIZE)"
+
+# 2. Upload su Google Drive
+rclone copy "$BACKUP_DIR/$FNAME" "$GDRIVE_DIR" --log-level ERROR 2>>"$LOG"
+log "Upload Drive completato: $GDRIVE_DIR/$FNAME"
+
+# 3. Cleanup locale > 7 giorni
+DELETED=$(find "$BACKUP_DIR" -name 'leopost_*.sql.gz' -mtime +$RETENTION_DAYS -print -delete | wc -l)
+log "Cleanup: $DELETED file rimossi (retention ${RETENTION_DAYS}gg)"
+
+log "--- Backup completato con successo ---"