feat(core,fuse,gui): places view from photo locations

Photos now know where they were taken. proton-drive-rs 0.7.0 reads the
Location from a photo's extended attributes, and the timeline refresh stores
it with the photo (schema v33). The migration marks every photo unresolved
once, so the next refresh backfills locations from node metadata without
downloading anything.

Towns are looked up offline: pdfs-core bundles GeoNames' cities15000 table,
trimmed by scripts/geonames-cities.py, and files each photo under the
nearest town within 50 km. The new PhotoPlaces and PlacePhotos requests list
the towns and page one town's photos.

The Photos page gets a third view, Places, with a card per town (newest
photo, town, country, count). A place opens in the gallery like an album.
Country names come translated from the iso-codes catalogs, now an optional
dependency. The About dialog credits GeoNames (CC BY 4.0).

crates/pdfs-core/src/db/tests.rs

@@ -293,6 +293,70 @@ fn hashed(uid: &str, capture_time: i64, name: &str, hash: &str) -> TimelineRow {
     }
 }
 
+fn located(uid: &str, capture_time: i64, name: &str, at: (f64, f64)) -> TimelineRow {
+    TimelineRow {
+        name: Some(name.into()),
+        location: Some(at),
+        resolved_at: Some(1),
+        ..TimelineRow::new(uid, capture_time)
+    }
+}
+
+const BERLIN: (f64, f64) = (52.52, 13.405);
+const PARIS: (f64, f64) = (48.857, 2.352);
+
+/// Places count shots, not files, lead with the most photographed town, and
+/// leave out photos with no location or taken far from any town.
+#[test]
+fn places_group_photos_by_the_nearest_town() {
+    let db = Db::open_in_memory().unwrap();
+    db.photos_replace(&[
+        located("b2", 500, "IMG_5.JPG", BERLIN),
+        located("p1", 400, "IMG_4.JPG", PARIS),
+        located("b1-jpeg", 300, "IMG_3.JPG", BERLIN),
+        located("b1-raw", 300, "IMG_3.CR2", BERLIN),
+        located("sea", 200, "IMG_2.JPG", (0.0, -30.0)),
+        TimelineRow::new("nowhere", 100),
+    ])
+    .unwrap();
+
+    let places = db.photo_places().unwrap();
+    let summary: Vec<(&str, usize, &str)> = places
+        .iter()
+        .map(|place| {
+            let city = crate::places::city(place.id).expect("a known town");
+            (city.name, place.count, place.cover.uid.as_str())
+        })
+        .collect();
+    assert_eq!(summary, [("Berlin", 2, "b2"), ("Paris", 1, "p1")]);
+
+    let berlin: Vec<String> = db
+        .photos_at_place(places[0].id, 0, 10)
+        .unwrap()
+        .into_iter()
+        .map(|p| p.uid)
+        .collect();
+    assert_eq!(berlin, ["b2", "b1-jpeg"]);
+}
+
+/// A refresh that skips an already-resolved photo keeps where it was taken; one
+/// that reads the node again takes what the node now says.
+#[test]
+fn a_skipped_refresh_keeps_a_photos_location() {
+    let db = Db::open_in_memory().unwrap();
+    db.photos_replace(&[located("a", 100, "IMG_1.JPG", BERLIN)])
+        .unwrap();
+    db.photos_replace(&[TimelineRow::new("a", 100)]).unwrap();
+    assert_eq!(db.photo_places().unwrap().len(), 1);
+
+    db.photos_replace(&[TimelineRow {
+        resolved_at: Some(2),
+        ..TimelineRow::new("a", 100)
+    }])
+    .unwrap();
+    assert!(db.photo_places().unwrap().is_empty());
+}
+
 /// A copy an album holds is the one kept; the files of one RAW+JPEG shot are
 /// never copies of each other; a hash only one file carries is no set.
 #[test]