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>

core/src/sync/compat.rs

@@ -146,7 +146,7 @@ pub fn evaluate(info: &ServerInfo) -> Compatibility {
         return incompatible(
             &format!(
                 "This server requires client protocol v{floor} or newer; this app \
-                 speaks v{CLIENT_PROTOCOL_VERSION}. Update ThoughtSync."
+                 speaks v{CLIENT_PROTOCOL_VERSION}. Update Inkwell."
             ),
             true,
         );
@@ -234,7 +234,7 @@ pub fn normalize_base_url(raw: &str) -> Option<String> {
     let with_scheme = match trimmed.split_once("://") {
         Some((scheme, rest)) => {
             // Anything that isn't HTTP(S) (ftp://, file://, a stray "foo://") can't
-            // be a ThoughtSync server; reject rather than fail confusingly later.
+            // be an Inkwell server; reject rather than fail confusingly later.
             let scheme = scheme.to_ascii_lowercase();
             if scheme != "http" && scheme != "https" {
                 return None;
@@ -259,7 +259,7 @@ mod tests {
     /// A server matching this client exactly, which each test then degrades.
     fn current_server() -> ServerInfo {
         ServerInfo {
-            site_name: Some("ThoughtSync".into()),
+            site_name: Some("Inkwell".into()),
             version: Some("0.1.0".into()),
             sync_protocol_version: Some(CLIENT_PROTOCOL_VERSION),
             min_client_protocol_version: Some(CLIENT_PROTOCOL_VERSION),
@@ -282,7 +282,7 @@ mod tests {
     fn server_without_protocol_fields_is_too_old() {
         // A pre-M10.6 server: /api/config parses, but carries no protocol block.
         let info = ServerInfo {
-            site_name: Some("ThoughtSync".into()),
+            site_name: Some("Inkwell".into()),
             version: Some("0.0.9".into()),
             ..Default::default()
         };