rename: the apps say Inkwell — web, desktop, Android and server strings

ThoughtSync is renamed Inkwell ("Fabled Inkwell" in full; Scribe note 5071).
This is step 1 of milestone 481: every string a person reads in the running
apps. Identities installed clients depend on are deliberately untouched — the
Tauri productName (it derives the .deb Package: field), identifier and binary
name, applicationId, X-ThoughtSync-* headers, the export's app marker, env vars,
module and crate names.

- web: title, PWA manifest (name "Fabled Inkwell", short_name "Inkwell"),
  offline page, icon labels, build labels, prompts, notification title
- server: site_name default, import error, link-preview User-Agent
- 0030: a stored site_name of exactly the old default follows the rename. The
  Settings page saves every key, so most servers hold "ThoughtSync" without an
  admin ever having chosen it; a name they typed is left alone
- desktop: window title, default device name, local-mode site name, log line
- android: app_name and the strings that name the app
- core: probe and compatibility messages

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/stores/config.ts

@@ -55,7 +55,7 @@ export interface PublicConfig {
 
 // Public, unauthenticated app config (site name, whether signups are open).
 export const useConfigStore = defineStore("config", () => {
-  const siteName = ref("ThoughtSync");
+  const siteName = ref("Inkwell");
   const allowRegistration = ref(true);
   const version = ref("");
   const enableUrlUnfurl = ref(true);

frontend/src/stores/reminders.ts

@@ -49,7 +49,7 @@ export const useReminderStore = defineStore("reminders", () => {
       });
       if (osEnabled.value) {
         try {
-          new Notification("ThoughtSync reminder", { body: title });
+          new Notification("Inkwell reminder", { body: title });
         } catch {
           /* notifications unavailable — the toast still fired */
         }