feat: bulk delete, team dispatch, calendar views, timeline colors

- Multi-select bulk delete in all 5 list views (Artefacts, Posts, Tasks,
  Issues, Assets) with cascade deletes and confirmation modals
- Team-based issue dispatch: team picker on public issue form, team filter
  on Issues page, copy public link from Team page and Issues header,
  team assignment in IssueDetailPanel
- Month/Week toggle on PostCalendar and TaskCalendarView
- Month/Week/Day zoom on project and campaign timelines (InteractiveTimeline)
  and ProjectDetail GanttView, with Month as default
- Custom timeline bar colors: clickable color dot with 12-color palette
  popover on project, campaign, and task timeline bars
- Artefacts default view changed to list
- BulkSelectBar reusable component
- i18n keys for all new features (en + ar)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/pages/Settings.jsx

@@ -2,10 +2,12 @@ import { useState, useEffect } from 'react'
 import { Settings as SettingsIcon, Play, CheckCircle, Languages, Coins, Upload } from 'lucide-react'
 import { api } from '../utils/api'
 import { useLanguage } from '../i18n/LanguageContext'
+import { useToast } from '../components/ToastContainer'
 import { CURRENCIES } from '../i18n/LanguageContext'
 
 export default function Settings() {
   const { t, lang, setLang, currency, setCurrency } = useLanguage()
+  const toast = useToast()
   const [restarting, setRestarting] = useState(false)
   const [success, setSuccess] = useState(false)
   const [maxSizeMB, setMaxSizeMB] = useState(50)
@@ -25,7 +27,7 @@ export default function Settings() {
       setSizeSaved(true)
       setTimeout(() => setSizeSaved(false), 2000)
     } catch (err) {
-      alert(err.message || 'Failed to save')
+      toast.error(err.message || t('settings.saveFailed'))
     } finally {
       setSizeSaving(false)
     }
@@ -42,7 +44,7 @@ export default function Settings() {
       }, 1500)
     } catch (err) {
       console.error('Failed to restart tutorial:', err)
-      alert('Failed to restart tutorial')
+      toast.error(t('settings.restartTutorialFailed'))
     } finally {
       setRestarting(false)
     }