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>

desktop/src-tauri/src/commands/local.rs

@@ -29,7 +29,7 @@ pub fn config_get(db: State<'_, Db>) -> PublicConfig {
     };
     // Offline defaults: no signups, no server-side URL unfurling (needs network).
     PublicConfig {
-        site_name: "ThoughtSync".to_string(),
+        site_name: "Inkwell".to_string(),
         allow_registration: false,
         // The build a person reads, baked at compile time — see crate::display_version
         // for why this is neither CARGO_PKG_VERSION nor the updater's ordering key.

desktop/src-tauri/src/commands/sync.rs

@@ -51,7 +51,7 @@ pub struct LinkResult {
 
 /// A recognizable default, so a server's device list doesn't fill up with "Device".
 fn default_device_name() -> String {
-    format!("ThoughtSync desktop ({})", std::env::consts::OS)
+    format!("Inkwell desktop ({})", std::env::consts::OS)
 }
 
 fn trimmed(value: &Option<String>) -> Option<&str> {

desktop/src-tauri/src/lib.rs

@@ -189,7 +189,7 @@ pub fn run() {
             capture::capture_done,
         ])
         .run(tauri::generate_context!())
-        .expect("error while running the ThoughtSync desktop app");
+        .expect("error while running the Inkwell desktop app");
 }
 
 /// Match the window's own background to the theme the UI is about to render in.
@@ -267,7 +267,7 @@ fn log_event(level: String, message: String) {
 fn log_environment(app: &tauri::App) {
     use tauri::Manager;
     log::info!(
-        "ThoughtSync desktop {} starting ({} {})",
+        "Inkwell desktop {} starting ({} {})",
         display_version(),
         std::env::consts::OS,
         std::env::consts::ARCH,