feat(todo): pick a place on a map, for quick add and a task's Where (ADR 0033, D32)

The location picker searches by city or district and name through
PlaceSearchGateway, its results a list and pins on Train's OpenFreeMap map,
or takes a pin placed by hand; recent places, and None, Arrive or Leave.
TodoDependencies.places is the seam for the instance's search; until then
komoot's public Photon, in a debug build asked for it alone. Quick add has
`+` suggestions, an entry in its + menu and a pin button; the task sheet a
Where box; a task's row the place's name.

ReminderScheduler plans the places to watch into LocationReminderGateway,
a no-op off Android, which TodoPerson.dispose clears, and Settings' Reminders
says while the device may not watch them.

Whats-New: Tasks can have locations: type + or use the + menu, search by city and name or pick on the map, and be reminded on arriving or leaving (Android).
Whats-New-De: Aufgaben können Orte haben: Tippe + oder nutze das +-Menü, suche nach Stadt und Name oder wähle auf der Karte, und lass dich beim Ankommen oder Verlassen erinnern (Android).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/todo/halkyon_todo_flutter/lib/l10n/app_en.arb

@@ -910,5 +910,120 @@
   "planFilterTitle": "Filter by project",
   "@planFilterTitle": {
     "description": "Today's Plan's project filter (ADR 0033, D30): its search field's hint and its name."
+  },
+  "locationTitle": "Location",
+  "@locationTitle": {
+    "description": "Quick add's + menu and its button (ADR 0033, D32)."
+  },
+  "locationAdd": "Add location",
+  "@locationAdd": {
+    "description": "A task's Where, and the picker's button."
+  },
+  "locationWhere": "Where",
+  "@locationWhere": {
+    "description": "The heading of a task's places."
+  },
+  "locationAnyOf": "Any of these",
+  "@locationAnyOf": {
+    "description": "Under a task's Where, with several places: they are alternatives."
+  },
+  "locationSearchHint": "City or district, then the name",
+  "@locationSearchHint": {
+    "description": "The location picker's search field."
+  },
+  "locationSearchAny": "Search for a place",
+  "@locationSearchAny": {
+    "description": "Quick add, as + is typed."
+  },
+  "locationSearchFor": "Search for “{query}”",
+  "@locationSearchFor": {
+    "description": "Quick add, as +something is typed.",
+    "placeholders": {
+      "query": {
+        "type": "String"
+      }
+    }
+  },
+  "locationSearchUnavailable": "Search isn't available here. Move the map and tap to place a pin.",
+  "@locationSearchUnavailable": {
+    "description": "The location picker without a place search."
+  },
+  "locationSearchFailed": "The search didn't work. Try again.",
+  "@locationSearchFailed": {
+    "description": "The location picker after a failed search."
+  },
+  "locationNoResults": "Nothing found",
+  "@locationNoResults": {
+    "description": "The location picker, a search without results."
+  },
+  "locationRecent": "Recent",
+  "@locationRecent": {
+    "description": "The location picker's places of the person's tasks."
+  },
+  "locationPin": "Pinned place",
+  "@locationPin": {
+    "description": "The name of a pin placed by hand where nothing names the spot."
+  },
+  "locationName": "Name",
+  "@locationName": {
+    "description": "The name field of a pin placed by hand."
+  },
+  "locationMine": "My position",
+  "@locationMine": {
+    "description": "The map's button."
+  },
+  "locationRemindNone": "No reminder",
+  "@locationRemindNone": {
+    "description": "A location's reminder."
+  },
+  "locationRemindArrive": "On arriving",
+  "@locationRemindArrive": {
+    "description": "A location's reminder."
+  },
+  "locationRemindLeave": "On leaving",
+  "@locationRemindLeave": {
+    "description": "A location's reminder."
+  },
+  "locationRemove": "Remove",
+  "@locationRemove": {
+    "description": "A task's location's menu."
+  },
+  "locationAccessTitle": "Allow location all the time",
+  "@locationAccessTitle": {
+    "description": "Before asking for the position in the background."
+  },
+  "locationAccessHint": "To remind you when you arrive or leave, Halkyon Todo needs your position while it is closed too. It stays on this device. Next, choose “Allow all the time”.",
+  "@locationAccessHint": {
+    "description": "Before asking for the position in the background."
+  },
+  "locationAccessGo": "Continue",
+  "@locationAccessGo": {
+    "description": "Before asking for the position in the background."
+  },
+  "locationOffTitle": "Location is off for reminders",
+  "@locationOffTitle": {
+    "description": "Settings' Reminders while places are planned and may not be watched."
+  },
+  "locationOffHint": "Reminders at a place need “Allow all the time”.",
+  "@locationOffHint": {
+    "description": "Settings' Reminders while places are planned and may not be watched."
+  },
+  "locationArrived": "You're at {name}",
+  "@locationArrived": {
+    "description": "A reminder on arriving, below the task's title.",
+    "placeholders": {
+      "name": {
+        "type": "String"
+      }
+    }
+  },
+  "locationLeft": "You've left {name}",
+  "@locationLeft": {
+    "description": "A reminder on leaving, below the task's title.",
+    "placeholders": {
+      "name": {
+        "type": "String"
+      }
+    }
   }
 }