Navigation restructure: five-tab bottom bar, no phone drawer

Drawer removed (phones only; desktop rail untouched)
- MobileSidebar, sidebarOpen/useSidebarOpen, MenuIcon and the drawer's
  back-gesture layer are gone; the shared nav content now serves only
  the desktop rail (dead mobile branches deleted). No drawer-specific
  CSS existed; the three drawer strings (header.openMenu,
  sidebar.closeMenu, common.menu) and library.importAria are removed.
- The header drops the hamburger: logo + name on the left, the single
  theme chip on the right.

Five-tab bottom bar
- Library / Progress / New deck (prominent centre +) / Exam / Settings,
  in that order; Progress and Exam reuse the existing /stats and /exam
  screens, Settings keeps opening the dialog. Sliding pill, icon bounce,
  press feedback, re-tap-to-top and safe-area padding kept; every item
  is >=44px (72px wide at 360px).
- New short tab.* keys (EN + CS) so all five labels stay on one line at
  360px — 'Zkouškový režim' became 'Zkouška'. No ellipsis anywhere.
- The bar is mounted once in AppHeader so library, progress, exam and
  share get it; the wizards keep their own bottom action bar and the
  tab bar steps aside there, exactly as before.

Re-homed drawer destinations
- Smart Review card loses the Exam link (it is a tab now); Review due
  and Mistakes stay.
- New deck screen (and /homework) get a Study deck / Make my homework
  segmented switch; the library's homework empty-state button stays.
- The phone import icon becomes a ... button opening a sheet with
  Import JSON and New folder (back-gesture and Escape close it); folder
  chips still appear only once at least one folder exists, and folder
  creation stays in the New deck options step.

Verified: mobile suite 134 checks (no hamburger/drawer, tab order and
44px targets, label matrix at 360/390 x EN/CS x dark/light x reduced
motion, per-tab routing, deep links, Back from every tab, the ... sheet
with folder creation) plus regression 74/74, wizard 83/83, declutter
116/116, animation 8/8, native 35/35, i18n 25/25, phase1 38/38, phase2
43/43, phase3 20/20, freeze-loading 6/6. Key parity 740/740. Lint +
build clean. SW freezmo-v28.

lib/i18n-dict.ts

@@ -84,7 +84,6 @@ const en: Record<string, string> = {
   "common.darkMode": "Dark mode",
   "common.switchToLight": "Switch to light mode",
   "common.switchToDark": "Switch to dark mode",
-  "common.menu": "Menu",
   "common.back": "Back",
   "common.next": "Next",
   "common.more": "More",
@@ -93,20 +92,24 @@ const en: Record<string, string> = {
   "common.stepOf": "{n} / {total}",
 
   /* header ---------------------------------------------------------- */
-  "header.openMenu": "Open menu",
   "header.home": "Freezmo home",
   "header.tagline": "study feed",
   "header.openSettings": "Open settings and Ollama status",
 
   /* tab bar --------------------------------------------------------- */
   "tabbar.main": "Main",
+  /* Short tab labels: they must stay on one line at 360px in both languages. */
+  "tab.library": "Library",
+  "tab.progress": "Progress",
+  "tab.new": "New deck",
+  "tab.exam": "Exam",
+  "tab.settings": "Settings",
 
   /* sidebar --------------------------------------------------------- */
   "sidebar.collapse": "Collapse sidebar",
   "sidebar.expand": "Expand sidebar",
   "sidebar.library": "Library",
   "sidebar.label": "Sidebar",
-  "sidebar.closeMenu": "Close menu",
 
   /* language -------------------------------------------------------- */
   "language.label": "Language",
@@ -267,6 +270,9 @@ const en: Record<string, string> = {
 
   /* make my homework ------------------------------------------------- */
   "homework.nav": "Make my homework",
+  "wizard.mode.deck": "Study deck",
+  "wizard.mode.homework": "Make my homework",
+  "wizard.mode.aria": "Study deck or homework",
   "homeworkHeroTitle": "Make my homework",
   "homework.subtitle": "Paste it, photograph it or add a file — then pick how I should help.",
   "homework.phone.assignment": "The assignment",
@@ -343,7 +349,8 @@ const en: Record<string, string> = {
   "library.title": "Your icebox",
   "library.subtitle": "Decks frozen from your notes, saved in this browser.",
   "library.import": "Import JSON",
-  "library.importAria": "Import deck JSON",
+  "library.moreActions": "More actions",
+  "library.moreTitle": "Library actions",
   "library.folderCreated": "Folder created — decks you freeze while it's selected land here.",
   "library.imported": "Imported “{title}”.",
   "library.couldNotRead": "Could not read that file.",
@@ -913,7 +920,6 @@ const cs: Record<string, string> = {
   "common.darkMode": "Tmavý režim",
   "common.switchToLight": "Přepnout na světlý režim",
   "common.switchToDark": "Přepnout na tmavý režim",
-  "common.menu": "Menu",
   "common.back": "Zpět",
   "common.next": "Další",
   "common.more": "Více",
@@ -922,20 +928,24 @@ const cs: Record<string, string> = {
   "common.stepOf": "{n} / {total}",
 
   /* header ---------------------------------------------------------- */
-  "header.openMenu": "Otevřít menu",
   "header.home": "Domů — Freezmo",
   "header.tagline": "studijní feed",
   "header.openSettings": "Otevřít nastavení a stav Ollamy",
 
   /* tab bar --------------------------------------------------------- */
   "tabbar.main": "Hlavní",
+  /* Krátké popisky záložek: musí zůstat na jednom řádku při 360px v obou jazycích. */
+  "tab.library": "Knihovna",
+  "tab.progress": "Pokrok",
+  "tab.new": "Nová sada",
+  "tab.exam": "Zkouška",
+  "tab.settings": "Nastavení",
 
   /* sidebar --------------------------------------------------------- */
   "sidebar.collapse": "Sbalit panel",
   "sidebar.expand": "Rozbalit panel",
   "sidebar.library": "Knihovna",
   "sidebar.label": "Postranní panel",
-  "sidebar.closeMenu": "Zavřít menu",
 
   /* language -------------------------------------------------------- */
   "language.label": "Jazyk",
@@ -1096,6 +1106,9 @@ const cs: Record<string, string> = {
 
   /* make my homework ------------------------------------------------- */
   "homework.nav": "Udělej mi úkol",
+  "wizard.mode.deck": "Studijní sada",
+  "wizard.mode.homework": "Udělej mi úkol",
+  "wizard.mode.aria": "Studijní sada nebo úkol",
   "homeworkHeroTitle": "Udělej mi úkol",
   "homework.subtitle": "Vlož ho, vyfoť nebo přidej soubor — a vyber, jak ti mám pomoct.",
   "homework.phone.assignment": "Zadání",
@@ -1172,7 +1185,8 @@ const cs: Record<string, string> = {
   "library.title": "Tvoje mraznička",
   "library.subtitle": "Sady zmrazené z tvých poznámek, uložené v tomto prohlížeči.",
   "library.import": "Importovat JSON",
-  "library.importAria": "Importovat JSON sady",
+  "library.moreActions": "Další akce",
+  "library.moreTitle": "Akce knihovny",
   "library.folderCreated": "Složka vytvořena — sady, které zmrazíš, když je vybraná, přistanou tady.",
   "library.imported": "Importováno „{title}“.",
   "library.couldNotRead": "Tento soubor se nepodařilo přečíst.",