TICKET-005: Frontend daily view — milestone M1 complete

- Dashboard: progress bar vs target, entries grouped by meal slot,
  edit/delete inline, date navigation (UTC-safe shiftDate helper)
- Add Food manual creation form, search-and-log flow with live preview
- Minimal target form; loading/error/empty states throughout
- Stores (current date, log, summary) with summary refresh on mutation
- All HTTP via lib/api.js; formatting via lib/format.js; runes only
- Full suites green (backend 104 passed, frontend vitest + build)

frontend/src/lib/stores.svelte.js

@@ -4,11 +4,87 @@
  * Svelte 5 runes style only (spec §8.2 rule 8).
  */
 
-// Current date as a YYYY-MM-DD string — the server never decides "today" (spec §8.1 rule 8)
-export const currentDate = $state({
-  value: new Date().toISOString().slice(0, 10),
+import { api } from './api.js'
+import { shiftDate } from './format.js'
+
+/** Return today as a YYYY-MM-DD string — the server never decides "today" (spec §8.1 rule 8). */
+function todayString() {
+  return new Date().toISOString().slice(0, 10)
+}
+
+// ── Current date ────────────────────────────────────────────────────────────
+
+export const currentDate = $state({ value: todayString() })
+
+export function setDate(dateStr) {
+  currentDate.value = dateStr
+}
+
+export function goPrevDay() {
+  currentDate.value = shiftDate(currentDate.value, -1)
+}
+
+export function goNextDay() {
+  currentDate.value = shiftDate(currentDate.value, 1)
+}
+
+// ── App view ─────────────────────────────────────────────────────────────────
+
+export const appView = $state({ current: 'dashboard' })
+
+/** Simple navigation requests from child components (e.g., "Set a target"). */
+export const navigateTo = (view) => { appView.current = view }
+
+// ── Day data (log + summary) ─────────────────────────────────────────────────
+
+export const dayData = $state({
+  log: [],
+  summary: null, // { date, totals: { calories, protein_g, ... }, target: {...} | null }
+  loading: false,
+  error: null,
 })
 
-// Today's log entries and current target, refreshed from the API after any mutation
-export const todayLog = $state({ entries: [], loading: false, error: null })
-export const currentTarget = $state({ target: null, loading: false, error: null })
+export async function refreshDayData() {
+  const date = currentDate.value
+  dayData.loading = true
+  dayData.error = null
+  try {
+    const [log, summary] = await Promise.all([
+      api.getLog(date),
+      api.getSummary(date),
+    ])
+    dayData.log = log
+    dayData.summary = summary
+    dayData.loading = false
+  } catch (e) {
+    dayData.error = e.message
+    dayData.loading = false
+  }
+}
+
+/** Re-fetch the summary for the current date without touching the log array. */
+async function refreshSummary() {
+  try {
+    dayData.summary = await api.getSummary(currentDate.value)
+  } catch {
+    // Keep the previous summary on failure; the user can retry.
+  }
+}
+
+/** Add a newly-created log entry to the store then refresh the summary. */
+export async function addLogEntryToStore(entry) {
+  dayData.log = [...dayData.log, entry]
+  await refreshSummary()
+}
+
+/** Update a log entry in the store after a successful API PUT, then refresh the summary. */
+export async function updateLogEntryInStore(updated) {
+  dayData.log = dayData.log.map(e => (e.id === updated.id ? updated : e))
+  await refreshSummary()
+}
+
+/** Remove a log entry from the store after a successful API DELETE, then refresh the summary. */
+export async function removeLogEntryFromStore(id) {
+  dayData.log = dayData.log.filter(e => e.id !== id)
+  await refreshSummary()
+}