feat(ui): view-by-view UX redesign and accessibility pass

- Overview: limits hero with progress states, spend pill, primary quick-add, mobile FAB
- Logbook: day-grouped entries with subtotals, unified filter bar, Log again,
  human source labels
- Trends: unified chart cards, tick thinning, chart aria summaries, radiogroup
  forecast control
- Settings: sectioned layout with separated danger zone, ThemePicker aria fix
- EntryModal: fieldset grouping, Field primitive, safe date validation
- AuthView: autoComplete, password visibility toggle
- StatHint popover replacing title-only tooltips; mobile stacked import preview
- Remaining inline hex styles converted to theme tokens

src/App.tsx

@@ -1,4 +1,5 @@
 import { AnimatePresence, motion } from "framer-motion";
+import { Plus } from "lucide-react";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { flavourMeta, mergedFlavours } from "./data/flavours";
 import { QUICK_ADDS, type QuickAddItem } from "./data/quickAdds";
@@ -323,6 +324,24 @@ function App() {
     setIsEntryModalOpen(true);
   }
 
+  function logEntryAgain(entry: RedBullEntry) {
+    setEditingEntry(null);
+    setEntryInitialDraft({
+      cans: entry.cans,
+      flavour: entry.flavour,
+      flavourAccent: entry.flavourAccent,
+      sizeMl: entry.sizeMl,
+      pricePerCan: entry.pricePerCan,
+      dateTime: new Date().toISOString(),
+      notes: entry.notes ?? "",
+      store: entry.store ?? "",
+      sugarFree: entry.sugarFree,
+      caffeineMgPerCan: entry.caffeineMgPerCan,
+      source: entry.source,
+    });
+    setIsEntryModalOpen(true);
+  }
+
   async function saveUserLimits(next: UserLimits) {
     if (!user) return;
     setBusyAction("save-limits");
@@ -677,6 +696,7 @@ function App() {
                     setIsEntryModalOpen(true);
                   }}
                   onDelete={(id) => setPendingDeleteId(id)}
+                  onLogAgain={logEntryAgain}
                 />
               )}
 
@@ -727,6 +747,12 @@ function App() {
 
       <MobileNav activeView={activeView} onChange={setActiveView} />
 
+      {activeView === "overview" && (
+        <button className="fab-add" type="button" onClick={openNewEntry} aria-label="Add intake">
+          <Plus size={26} aria-hidden="true" />
+        </button>
+      )}
+
       <EntryModal
         entry={editingEntry}
         initialDraft={entryInitialDraft}