feat: dochazka Excel export + auto-reload + 162 filter

- Add dochazka Excel export using direct ZIP/XML manipulation of template
  (preserves styles.xml byte-for-byte to avoid Excel "repaired styles" warning)
- Calculate per-person stravné doplatek, transport (AUV), and indiv1
  (closure count + Janouš internet) per sichtovnice.py logic
- Filter exported people to TEMPLATE_NAMES (12 fixed template rows)
- Add server version polling + auto-reload on deploy
- Add FPD check modal for monthly hour validation
- Add "162" filter button to hide first 5 TKB people from view

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

web/src/Login.tsx

@@ -2,18 +2,33 @@ import { useState } from 'react'
 
 const VALID_USER = 'tkb'
 const VALID_PASS = 'sluzby'
+const VIEWER_USER = 'prohlizec'
+const VIEWER_PASS = 'pohled'
 const AUTH_KEY = 'tkb_auth'
+const ROLE_KEY = 'tkb_role'
+
+export type UserRole = 'editor' | 'viewer'
 
 export function isAuthenticated(): boolean {
-  return sessionStorage.getItem(AUTH_KEY) === 'true'
+  return localStorage.getItem(AUTH_KEY) === 'true'
 }
 
-export function setAuthenticated(): void {
-  sessionStorage.setItem(AUTH_KEY, 'true')
+export function getAuthRole(): UserRole {
+  return localStorage.getItem(ROLE_KEY) === 'viewer' ? 'viewer' : 'editor'
+}
+
+function setAuthenticated(role: UserRole): void {
+  localStorage.setItem(AUTH_KEY, 'true')
+  localStorage.setItem(ROLE_KEY, role)
+}
+
+export function clearAuthentication(): void {
+  localStorage.removeItem(AUTH_KEY)
+  localStorage.removeItem(ROLE_KEY)
 }
 
 interface LoginProps {
-  onLogin: () => void
+  onLogin: (role: UserRole) => void
 }
 
 export function Login({ onLogin }: LoginProps) {
@@ -24,8 +39,11 @@ export function Login({ onLogin }: LoginProps) {
   const handleSubmit = (e: React.FormEvent) => {
     e.preventDefault()
     if (username === VALID_USER && password === VALID_PASS) {
-      setAuthenticated()
-      onLogin()
+      setAuthenticated('editor')
+      onLogin('editor')
+    } else if (username === VIEWER_USER && password === VIEWER_PASS) {
+      setAuthenticated('viewer')
+      onLogin('viewer')
     } else {
       setError(true)
       setTimeout(() => setError(false), 3000)
@@ -39,13 +57,13 @@ export function Login({ onLogin }: LoginProps) {
         className="bg-slate-800 border border-slate-700 rounded-lg p-8 w-80 shadow-xl"
       >
         <h1 className="text-lg font-semibold text-slate-100 mb-1 text-center">
-          TKB Plan sluzeb
+          TKB Plán služeb
         </h1>
         <p className="text-sm text-slate-400 mb-6 text-center">
-          Planovani smen a pohotovosti
+          Plánování směn a pohotovostí
         </p>
 
-        <label className="block text-xs text-slate-400 mb-1">Uzivatel</label>
+        <label className="block text-xs text-slate-400 mb-1">Uživatel</label>
         <input
           type="text"
           value={username}
@@ -66,7 +84,7 @@ export function Login({ onLogin }: LoginProps) {
 
         {error && (
           <div className="mb-4 text-xs text-red-400 text-center">
-            Nespravne prihlasovaci udaje
+            Nesprávné přihlašovací údaje
           </div>
         )}
 
@@ -75,7 +93,7 @@ export function Login({ onLogin }: LoginProps) {
           className="w-full py-2 rounded bg-blue-600 hover:bg-blue-500 text-white text-sm
                      font-medium transition-colors cursor-pointer"
         >
-          Prihlasit
+          Přihlásit
         </button>
       </form>
     </div>