feat(updater): self-update via GitHub Releases with launch check and settings UI

Phase 3 of the 0.1.0 release prep:
- tauri-plugin-updater + tauri-plugin-process wired into the builder, with
  updater:default / process:allow-restart capabilities
- bundle.createUpdaterArtifacts: true; endpoint points at the GitHub
  releases latest.json, pubkey baked into tauri.conf.json
- store: update status state machine (check / download progress / install)
  with a quiet launch check (prod only) that stays silent on network errors
- UI: dismissible update toast with download progress, plus an Updates group
  in Settings > General showing current version and manual check/install

pnpm-lock.yaml

@@ -26,6 +26,12 @@ importers:
       '@tauri-apps/plugin-opener':
         specifier: ^2
         version: 2.5.3
+      '@tauri-apps/plugin-process':
+        specifier: ^2.3.1
+        version: 2.3.1
+      '@tauri-apps/plugin-updater':
+        specifier: ^2.10.1
+        version: 2.10.1
       d3-force:
         specifier: ^3.0.0
         version: 3.0.0
@@ -662,6 +668,12 @@ packages:
   '@tauri-apps/plugin-opener@2.5.3':
     resolution: {integrity: sha512-CCcUltXMOfUEArbf3db3kCE7Ggy1ExBEBl51Ko2ODJ6GDYHRp1nSNlQm5uNCFY5k7/ufaK5Ib3Du/Zir19IYQQ==}
 
+  '@tauri-apps/plugin-process@2.3.1':
+    resolution: {integrity: sha512-nCa4fGVaDL/B9ai03VyPOjfAHRHSBz5v6F/ObsB73r/dA3MHHhZtldaDMIc0V/pnUw9ehzr2iEG+XkSEyC0JJA==}
+
+  '@tauri-apps/plugin-updater@2.10.1':
+    resolution: {integrity: sha512-NFYMg+tWOZPJdzE/PpFj2qfqwAWwNS3kXrb1tm1gnBJ9mYzZ4WDRrwy8udzWoAnfGCHLuePNLY1WVCNHnh3eRA==}
+
   '@types/babel__core@7.20.5':
     resolution: {integrity: sha512-qoQprZvz5wQFJwMDqeseRXWv3rqMvhgpbXFfVyWhbx9X47POIA6i/+dXefEmZKoAgOaTdaIgNSMqMIU61yRyzA==}
 
@@ -1462,6 +1474,14 @@ snapshots:
     dependencies:
       '@tauri-apps/api': 2.10.1
 
+  '@tauri-apps/plugin-process@2.3.1':
+    dependencies:
+      '@tauri-apps/api': 2.10.1
+
+  '@tauri-apps/plugin-updater@2.10.1':
+    dependencies:
+      '@tauri-apps/api': 2.10.1
+
   '@types/babel__core@7.20.5':
     dependencies:
       '@babel/parser': 7.29.2