feat: TKB shift scheduler — personnel shift planning web app

Full rewrite of METRO HMG for TKB tunnel department:
- People-based grid (18 TKB + 5 IT), year-long calendar
- Color-coded shift values (4/6/8/12/A/B/D/N/U/O)
- Drag-and-drop cells, multi-cell selection (click/ctrl/shift/drag)
- Right-click context menu with color palette
- Tunnel closure + Metro + D8 info rows (toggleable)
- Czech holidays highlighted with names
- PDF export (2-page A4 landscape, DejaVu font for Czech chars)
- Improvement proposals system
- Sticky headers (vertical + horizontal scroll)
- Cell value filter toggles in legend

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/watch-deploy.js

@@ -0,0 +1,33 @@
+import { watch } from 'fs'
+import { execSync } from 'child_process'
+import { join } from 'path'
+import { fileURLToPath } from 'url'
+import { dirname } from 'path'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+const SRC_DIR = join(__dirname, 'src')
+const DEPLOY_SCRIPT = join(__dirname, 'deploy.sh')
+const COOLDOWN_MS = 5000
+
+let timer = null
+
+console.log(`Watching ${SRC_DIR} for changes...`)
+console.log('Auto-deploying to copelk on save')
+console.log('Press Ctrl+C to stop\n')
+
+watch(SRC_DIR, { recursive: true }, (event, filename) => {
+  if (!filename) return
+
+  console.log(`[${new Date().toLocaleTimeString()}] ${event}: ${filename}`)
+
+  if (timer) clearTimeout(timer)
+  timer = setTimeout(() => {
+    console.log('\nDeploying...\n')
+    try {
+      execSync(`bash ${DEPLOY_SCRIPT}`, { stdio: 'inherit' })
+      console.log('\nWatching for next change...\n')
+    } catch (e) {
+      console.error('Deploy failed:', e.message)
+    }
+  }, COOLDOWN_MS)
+})