feat(mobile): replace 'This year' with dynamic per-year pills in filter tab

Date row now shows All time | 7d | 30d | 6mo | 2026 | 2025 | ... derived
from actual activity data. Year pills use a bounded [Jan 1, Jan 1+1) range
via a new dateTo field on ActivityFilter; rolling-window presets keep an
open upper bound.

mobile/app/(tabs)/search.tsx

@@ -1,10 +1,9 @@
 import { useState } from 'react';
 import { FlatList, Pressable, ScrollView, StyleSheet, Text, View } from 'react-native';
-import { PAGE_SIZE, useFilteredActivities, useFilteredCount, type ActivityFilter } from '@/db/queries';
+import { PAGE_SIZE, useActivityYears, useFilteredActivities, useFilteredCount, type ActivityFilter } from '@/db/queries';
 import { ActivityCard } from '@/components/ActivityCard';
 import { useTheme } from '@/ThemeContext';
 
-type DatePreset = 'all' | '7d' | '30d' | '6mo' | 'year';
 type SortKey = 'date' | 'distance' | 'elevation';
 
 const SPORTS = [
@@ -16,12 +15,11 @@ const SPORTS = [
   { value: 'walking',  label: '🚶 Walking' },
 ];
 
-const DATE_PRESETS: { value: DatePreset; label: string }[] = [
+const DATE_PRESETS = [
   { value: 'all',  label: 'All time' },
   { value: '7d',   label: '7 days' },
   { value: '30d',  label: '30 days' },
   { value: '6mo',  label: '6 months' },
-  { value: 'year', label: 'This year' },
 ];
 
 const SORTS: { value: SortKey; label: string }[] = [
@@ -30,26 +28,33 @@ const SORTS: { value: SortKey; label: string }[] = [
   { value: 'elevation', label: 'Elevation' },
 ];
 
-function computeDateFrom(preset: DatePreset): string {
+function computeDateRange(preset: string): { dateFrom: string; dateTo: string } {
-  if (preset === 'all') return '';
+  if (preset === 'all') return { dateFrom: '', dateTo: '' };
+  if (/^\d{4}$/.test(preset)) {
+    const y = parseInt(preset, 10);
+    return { dateFrom: `${y}-01-01T000000Z`, dateTo: `${y + 1}-01-01T000000Z` };
+  }
   const pad = (n: number) => String(n).padStart(2, '0');
   const now = new Date();
   let d: Date;
   if      (preset === '7d')  d = new Date(now.getTime() - 7  * 86_400_000);
   else if (preset === '30d') d = new Date(now.getTime() - 30 * 86_400_000);
-  else if (preset === '6mo') { d = new Date(now); d.setMonth(d.getMonth() - 6); }
+  else                       { d = new Date(now); d.setMonth(d.getMonth() - 6); }
-  else                       d = new Date(now.getFullYear(), 0, 1);
+  return { dateFrom: `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T000000Z`, dateTo: '' };
-  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T000000Z`;
 }
 
 export default function SearchScreen() {
   const theme = useTheme();
   const [sport,   setSport]   = useState('');
-  const [datePre, setDatePre] = useState<DatePreset>('all');
+  const [datePre, setDatePre] = useState('all');
   const [sort,    setSort]    = useState<SortKey>('date');
   const [limit,   setLimit]   = useState(PAGE_SIZE);
 
-  const filter: ActivityFilter = { sport, dateFrom: computeDateFrom(datePre), sort };
+  const years = useActivityYears();
+  const dateOptions = [...DATE_PRESETS, ...years.map(y => ({ value: y, label: y }))];
+
+  const { dateFrom, dateTo } = computeDateRange(datePre);
+  const filter: ActivityFilter = { sport, dateFrom, dateTo, sort };
   const activities = useFilteredActivities(filter, limit);
   const total      = useFilteredCount(filter);
   const hasMore    = activities.length < total;
@@ -71,7 +76,7 @@ export default function SearchScreen() {
 
       <ScrollView horizontal showsHorizontalScrollIndicator={false}
         style={styles.pillScroll} contentContainerStyle={styles.pillRow}>
-        {DATE_PRESETS.map(d => (
+        {dateOptions.map(d => (
           <Pill key={d.value} label={d.label} active={datePre === d.value} accent={theme.accent}
             onPress={() => { setDatePre(d.value); setLimit(PAGE_SIZE); }} />
         ))}

mobile/db/queries.ts

@@ -70,6 +70,7 @@ export { PAGE_SIZE };
 export type ActivityFilter = {
   sport: string;    // '' = all sports
   dateFrom: string; // '' = no lower bound; ISO-like 'YYYY-MM-DDTHHMMSSZ' for comparison
+  dateTo: string;   // '' = no upper bound
   sort: 'date' | 'distance' | 'elevation';
 };
 
@@ -95,9 +96,10 @@ export function useFilteredActivities(filter: ActivityFilter, limit = PAGE_SIZE)
     FROM activities
     WHERE (? = '' OR json_extract(detail_json, '$.sport') = ?)
       AND (? = '' OR json_extract(detail_json, '$.started_at') >= ?)
+      AND (? = '' OR json_extract(detail_json, '$.started_at') <  ?)
     ORDER BY ${order}
     LIMIT ?
-  `, [filter.sport, filter.sport, filter.dateFrom, filter.dateFrom, limit]);
+  `, [filter.sport, filter.sport, filter.dateFrom, filter.dateFrom, filter.dateTo, filter.dateTo, limit]);
 }
 
 export function useFilteredCount(filter: ActivityFilter): number {
@@ -106,10 +108,22 @@ export function useFilteredCount(filter: ActivityFilter): number {
     SELECT COUNT(*) as n FROM activities
     WHERE (? = '' OR json_extract(detail_json, '$.sport') = ?)
       AND (? = '' OR json_extract(detail_json, '$.started_at') >= ?)
-  `, [filter.sport, filter.sport, filter.dateFrom, filter.dateFrom]);
+      AND (? = '' OR json_extract(detail_json, '$.started_at') <  ?)
+  `, [filter.sport, filter.sport, filter.dateFrom, filter.dateFrom, filter.dateTo, filter.dateTo]);
   return row?.n ?? 0;
 }
 
+export function useActivityYears(): string[] {
+  const db = useSQLiteContext();
+  const rows = db.getAllSync<{ year: string }>(
+    `SELECT DISTINCT substr(json_extract(detail_json, '$.started_at'), 1, 4) AS year
+     FROM activities
+     WHERE json_extract(detail_json, '$.started_at') IS NOT NULL
+     ORDER BY year DESC`,
+  );
+  return rows.map(r => r.year).filter(Boolean);
+}
+
 export function useActivity(id: string): ActivityRow | null {
   const db = useSQLiteContext();
   return db.getFirstSync<ActivityRow>(