Refactor coach to plain Appwrite storage with integrated overview UI.

Remove client-side encryption, migrate coach_chats schema, fix the Ollama proxy, and embed coach on overview alongside the dedicated tab.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/greeting.ts

@@ -0,0 +1,90 @@
+import { groupByFlavour } from "./metrics";
+
+type GreetingInput = {
+  name: string;
+  todayCans: number;
+  favouriteFlavour: string;
+  currentStreak: number;
+  todayCaffeineMg: number;
+  allTimeCans: number;
+};
+
+type GreetingResult = {
+  badge: string;
+  headline: string;
+  subline: string;
+};
+
+export function getBstHour(date = new Date()) {
+  const hour = new Intl.DateTimeFormat("en-GB", {
+    timeZone: "Europe/London",
+    hour: "numeric",
+    hour12: false,
+  }).format(date);
+  return Number.parseInt(hour, 10);
+}
+
+export function buildDynamicGreeting(input: GreetingInput): GreetingResult {
+  const hour = getBstHour();
+  const timeLabel = timeOfDayLabel(hour);
+  const cans = input.todayCans;
+  const favourite =
+    input.favouriteFlavour === "None yet" ? null : input.favouriteFlavour;
+  const streak = input.currentStreak;
+
+  const badge = cans === 0 ? `${timeLabel} · clear slate` : `${timeLabel} · ${cans} today`;
+
+  let headline: string;
+  if (cans === 0) {
+    headline =
+      streak > 0
+        ? `${input.name}, nothing logged yet today — ${streak}-day streak still alive.`
+        : `${input.name}, no Red Bulls logged yet this ${hour < 12 ? "morning" : hour < 17 ? "afternoon" : "evening"}.`;
+  } else if (cans === 1) {
+    headline = `${input.name}, one Red Bull in so far today.`;
+  } else if (cans <= 3) {
+    headline = `${input.name}, ${cans} Red Bulls today — steady pace.`;
+  } else {
+    headline = `${input.name}, ${cans} Red Bulls today — worth watching the caffeine curve.`;
+  }
+
+  const flavourLine = favourite
+    ? cans > 0
+      ? `Today's top pick looks like ${favourite}.`
+      : `All-time favourite: ${favourite} (${input.allTimeCans} cans logged).`
+    : "Your flavour story is just getting started.";
+
+  const caffeineLine =
+    cans > 0 && input.todayCaffeineMg > 0
+      ? `~${Math.round(input.todayCaffeineMg)}mg caffeine so far.`
+      : hour >= 17 && cans === 0
+        ? "Evening reset — clean slate if you want it."
+        : hour >= 22
+          ? "Late night — pace yourself if you're still going."
+          : "Log an intake to unlock today's signals.";
+
+  return {
+    badge,
+    headline,
+    subline: [flavourLine, caffeineLine].join(" "),
+  };
+}
+
+export function buildFlavourHistorySummary(entries: Parameters<typeof groupByFlavour>[0]) {
+  const breakdown = groupByFlavour(entries);
+  if (!breakdown.length) return "No flavour history yet.";
+
+  return breakdown
+    .map((item, index) => {
+      const rank = index === 0 ? " (all-time favourite)" : "";
+      return `- ${item.name}: ${item.value} cans${rank}`;
+    })
+    .join("\n");
+}
+
+function timeOfDayLabel(hour: number) {
+  if (hour >= 5 && hour < 12) return "morning";
+  if (hour >= 12 && hour < 17) return "afternoon";
+  if (hour >= 17 && hour < 22) return "evening";
+  return "night";
+}