feat: consumption page date filter — pick a day, see its detail

- HTML <input type=date> in a GET form, zero client JS (same server-component model)
- selected day detail card with tiles + rows above the period summary
- day-by-day list entries link to /consumption?date=YYYY-MM-DD and open+highlight the selected one
- 'Temizle' clears the filter

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/app/consumption/page.tsx

@@ -1,3 +1,4 @@
+import Link from "next/link";
 import { requireSession } from "@/lib/auth";
 import { loadOverview, sumDays } from "@/lib/data";
 import { duration, efficiency, isoDate, num, precise } from "@/lib/format";
@@ -6,8 +7,13 @@ import { Row, Shell, Tile } from "@/components/shell";
 
 export const dynamic = "force-dynamic";
 
-export default async function ConsumptionPage() {
+export default async function ConsumptionPage({
+  searchParams,
+}: {
+  searchParams: Promise<{ date?: string }>;
+}) {
   await requireSession();
+  const { date: selectedDate } = await searchParams;
   const { installationId, days } = await loadOverview(90, 1);
 
   if (!installationId || days.length === 0) {
@@ -26,8 +32,74 @@ export default async function ConsumptionPage() {
   // Newest first for reading; the charts above keep chronological order.
   const table = [...days].reverse();
 
+  // Find the selected day's record (if any). table is newest-first; a Map would be overkill
+  // for ≤90 entries.
+  const selected = selectedDate ? table.find((d) => d.date === selectedDate) : null;
+  const hasFilter = !!selectedDate;
+  const validFilter = hasFilter && !!selected;
+
+  // Date input bounds: oldest record to today.
+  const minDate = days[0].date; // days is chronological (oldest first after loadOverview reverse)
+  const maxDate = new Date().toISOString().slice(0, 10);
+
   return (
-    <Shell active="/consumption" title="Tüketim" subtitle={`${days.length} günlük kayıt`}>
+    <Shell
+      active="/consumption"
+      title="Tüketim"
+      subtitle={hasFilter ? (validFilter ? isoDate(selectedDate!) : "Seçili gün kaydı yok") : `${days.length} günlük kayıt`}
+    >
+      {/* Date filter */}
+      <section className="card">
+        <form className="filter-form" method="get" action="/consumption">
+          <label className="filter-label" htmlFor="date-picker">
+            Tarihe göre filtrele
+          </label>
+          <div className="filter-row">
+            <input
+              id="date-picker"
+              type="date"
+              name="date"
+              defaultValue={selectedDate ?? ""}
+              min={minDate}
+              max={maxDate}
+              className="field date-input"
+            />
+            <button className="button filter-button" type="submit">Filtrele</button>
+            {hasFilter && (
+              <Link className="filter-clear" href="/consumption">Temizle</Link>
+            )}
+          </div>
+        </form>
+      </section>
+
+      {/* Selected day detail — shown above the period tiles when a filter is active */}
+      {hasFilter && (
+        <section className="card">
+          <h2 className="card-title">{isoDate(selectedDate!)}</h2>
+          {validFilter && selected ? (
+            <>
+              <div className="tiles">
+                <Tile label="Mesafe" value={num(selected.day.km)} unit="km" tone="teal" />
+                <Tile label="Enerji" value={precise(selected.day.kwh)} unit="kWh" tone="gold" />
+                <Tile label="Ortalama" value={efficiency(selected.day.kwh, selected.day.km)} tone="teal" />
+                <Tile
+                  label="Ortalama hız"
+                  value={selected.day.hours > 0 ? num(selected.day.km / selected.day.hours) : "—"}
+                  unit={selected.day.hours > 0 ? "km/h" : undefined}
+                />
+              </div>
+              <div className="rows">
+                <Row label="Sürüş süresi" value={duration(selected.day.hours * 3600)} />
+                <Row label="Doluluk düşüşü" value={`%${num(selected.day.socDrop)}`} />
+                <Row label="O gün sonu ömür boyu" value={`${num(selected.lifetime.km)} km`} />
+              </div>
+            </>
+          ) : (
+            <p className="empty">Bu tarih için tüketim kaydı yok.</p>
+          )}
+        </section>
+      )}
+
       <div className="tiles">
         <Tile label="Toplam mesafe" value={num(total.km)} unit="km" tone="teal" />
         <Tile label="Toplam enerji" value={precise(total.kwh)} unit="kWh" tone="gold" />
@@ -62,35 +134,42 @@ export default async function ConsumptionPage() {
       <section className="card">
         <h2 className="card-title">Gün gün</h2>
         <ul className="list">
-          {table.map((day) => (
-            <li key={day.date}>
-              <details className="session">
-                <summary>
-                  <div>
-                    <div className="session-when">{isoDate(day.date)}</div>
-                    <div className="session-meta">
-                      {num(day.day.km)} km · {efficiency(day.day.kwh, day.day.km)}
+          {table.map((day) => {
+            const isSelected = hasFilter && day.date === selectedDate;
+            return (
+              <li key={day.date}>
+                <details className={`session${isSelected ? " selected" : ""}`} open={isSelected}>
+                  <summary>
+                    <div>
+                      <div className="session-when">
+                        <Link href={`/consumption?date=${day.date}`} className="day-link">
+                          {isoDate(day.date)}
+                        </Link>
+                      </div>
+                      <div className="session-meta">
+                        {num(day.day.km)} km · {efficiency(day.day.kwh, day.day.km)}
+                      </div>
+                    </div>
+                    <div className="session-energy">
+                      {precise(day.day.kwh)}
+                      <span className="session-cost"> kWh</span>
+                    </div>
+                  </summary>
+                  <div className="session-body">
+                    <div className="rows">
+                      <Row label="Sürüş süresi" value={duration(day.day.hours * 3600)} />
+                      <Row
+                        label="Ortalama hız"
+                        value={day.day.hours > 0 ? `${num(day.day.km / day.day.hours)} km/h` : "—"}
+                      />
+                      <Row label="Doluluk düşüşü" value={`%${num(day.day.socDrop)}`} />
+                      <Row label="O gün sonu ömür boyu" value={`${num(day.lifetime.km)} km`} />
                     </div>
                   </div>
-                  <div className="session-energy">
-                    {precise(day.day.kwh)}
-                    <span className="session-cost"> kWh</span>
-                  </div>
-                </summary>
-                <div className="session-body">
-                  <div className="rows">
-                    <Row label="Sürüş süresi" value={duration(day.day.hours * 3600)} />
-                    <Row
-                      label="Ortalama hız"
-                      value={day.day.hours > 0 ? `${num(day.day.km / day.day.hours)} km/h` : "—"}
-                    />
-                    <Row label="Doluluk düşüşü" value={`%${num(day.day.socDrop)}`} />
-                    <Row label="O gün sonu ömür boyu" value={`${num(day.lifetime.km)} km`} />
-                  </div>
-                </div>
-              </details>
-            </li>
-          ))}
+                </details>
+              </li>
+            );
+          })}
         </ul>
       </section>
     </Shell>