Add daily notification wakeups and a make watchapp packaging target

Schedules a one-shot Pebble wakeup for the configured notification
time, re-arming it on every launch and config change, and vibrates/
refreshes the report when it fires (foreground or fresh launch).
Also adds a `make watchapp` target that builds the watchapp via the
Pebble SDK and copies a versioned .pbw to dist/, matching `make
package`'s version resolution — deliberately not wired into CI, which
has no Pebble SDK installed.

watch/src/c/main.c

@@ -4,6 +4,7 @@
 #include "app_message.h"
 #include "config.h"
 #include "i18n_tables.h"
+#include "notify.h"
 #include "reading_state.h"
 #include "ui_report_window.h"
 #include "ui_text_window.h"
@@ -26,6 +27,7 @@ static void on_config_updated(const WatchConfig *cfg) {
 
   config_log(&s_config); /* the values this newly-recomputed reading is based on */
   reading_state_recompute(&s_config.birth, s_config.gender);
+  notify_reschedule(&s_config); /* settings may have changed notify_enabled/hour/minute */
   if (was_configured) {
     report_window_reload();
   } else {
@@ -33,16 +35,36 @@ static void on_config_updated(const WatchConfig *cfg) {
   }
 }
 
+/* Fires only if the scheduled wakeup goes off while this app is already
+ * open (notify_was_wakeup_launch() below covers the far more common
+ * case: the wakeup launching the app fresh). Refreshes the same way a
+ * new day's config submission would, since the report window is already
+ * on screen and the reading may now be for a new day. */
+static void on_wakeup(WakeupId wakeup_id, int32_t cookie) {
+  (void)wakeup_id;
+  (void)cookie;
+  vibes_double_pulse();
+  if (!s_config.configured) return;
+  reading_state_recompute(&s_config.birth, s_config.gender);
+  report_window_reload();
+  notify_reschedule(&s_config); /* wakeup_schedule() is one-shot - re-arm for tomorrow */
+}
+
 int main(void) {
   config_load(&s_config);
   watch_i18n_load(s_config.lang);
   app_message_init(on_config_updated);
+  notify_subscribe(on_wakeup);
 
   config_log(&s_config); /* the values this session's reading (if any) is based on */
 
   if (s_config.configured) {
     reading_state_recompute(&s_config.birth, s_config.gender);
     report_window_push();
+    notify_reschedule(&s_config); /* wakeup_schedule() is one-shot - re-arm on every launch */
+    if (notify_was_wakeup_launch()) {
+      vibes_double_pulse();
+    }
   } else {
     show_setup_required();
   }