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/components/DesktopIntegrationPrompt.vue

@@ -5,7 +5,7 @@ import BaseButton from "./BaseButton.vue";
 import { isDesktop, desktop } from "../desktop/bridge";
 import { useUiStore } from "../stores/ui";
 
-// First-run prompt (Linux AppImage only) offering to add ThoughtSync to the
+// First-run prompt (Linux AppImage only) offering to add Inkwell to the
 // applications menu so it behaves like an installed app instead of a loose file.
 // Shown once; the choice is remembered. Users who decline can integrate later from
 // Account. No-op on the web build and on already-integrated / non-AppImage runs.
@@ -36,7 +36,7 @@ async function integrate() {
     await desktop.integrate();
     localStorage.setItem(DISMISS_KEY, "1");
     show.value = false;
-    ui.showToast("ThoughtSync added to your applications menu.");
+    ui.showToast("Inkwell added to your applications menu.");
   } catch (e) {
     ui.showToast((e as { message?: string }).message ?? "Couldn't add to applications.");
   } finally {
@@ -50,15 +50,15 @@ async function integrate() {
     v-if="show"
     align="center"
     panel-class="w-full max-w-md shadow-xl"
-    aria-label="Add ThoughtSync to your applications"
+    aria-label="Add Inkwell to your applications"
     @close="dismiss"
   >
     <div class="p-6">
       <h2 class="text-lg font-bold tracking-tight text-neutral-900 dark:text-neutral-100">
-        Add ThoughtSync to your applications?
+        Add Inkwell to your applications?
       </h2>
       <p class="mt-2 text-sm text-neutral-600 dark:text-neutral-400">
-        We'll add a menu entry so you can launch ThoughtSync from your app launcher, and keep a stable
+        We'll add a menu entry so you can launch Inkwell from your app launcher, and keep a stable
         copy in <code class="font-mono text-xs">~/Applications</code> so it isn't lost from Downloads.
         You can undo this any time from your account.
       </p>