rename: the desktop is Inkwell — crates, Tauri identity, data move, packaging

Step 3 of milestone 481 (Scribe note 5071: a full rename).

- crates thoughtsync-{core,desktop,ffi,uniffi-bindgen} → inkwell-*, the
  Cargo.lock entries moved to match (checked with `cargo metadata --locked`)
- Tauri: productName "Inkwell", identifier com.fabledsword.inkwell, binary
  `inkwell`, updater feed on bvandeusen/inkwell, store file inkwell.db
- client agent inkwell-desktop, headers X-Inkwell-Client/-Protocol (the server
  reads neither), capture event inkwell://captured, display-version env
- .deb: conflicts + replaces thought-sync, so the updater's install retires the
  old package instead of colliding on it. kebab-case("Inkwell") is `inkwell`, so
  the package name finally matches the command and verify.sh now asserts it
- pacman: inkwell, conflicting with and replacing thoughtsync and
  thoughtsync-desktop
- AppImage ~/Applications/Inkwell.AppImage, menu entry inkwell.desktop,
  installer, release titles, desktop asset names in fetch-clients.sh

The one shim, chosen by the operator because it is the only copy of a
local-first user's notes: crossover.rs moves the old
com.fabledsword.thoughtsync app-data dir's contents into the new one on startup,
before the store opens, renaming thoughtsync.db and its -wal/-shm with it. It
skips when the new dir already has a store, and anything already in the new dir
wins (the installer writes its channel marker there first). Tested.

Android's Kotlin side (package, applicationId, uniffi class) is step 4. Its
release asset names stay thoughtsync.* until then.

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

desktop/src-tauri/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "thoughtsync-desktop"
+name = "inkwell-desktop"
 # NOT THE SHIPPED VERSION, and bumping it has no effect on anything a user sees.
 #
 # Cargo requires a version here, and Tauri reads one from `tauri.conf.json` — both
@@ -13,11 +13,11 @@ name = "thoughtsync-desktop"
 # what that looked like in the field. A scheme needing a human to remember something
 # before each release has not removed the decision, only hidden it.
 version = "0.2.0"
-description = "ThoughtSync desktop — local-first Keep-style thought capture"
+description = "Inkwell desktop — local-first Keep-style thought capture"
 authors = ["bvandeusen"]
 edition = "2021"
 # The executable is named below, not inferred from this package name. Off so the
-# inferred `thoughtsync-desktop` target and the explicit one can't both claim
+# inferred `inkwell-desktop` target and the explicit one can't both claim
 # src/main.rs.
 autobins = false
 
@@ -25,23 +25,23 @@ autobins = false
 # main.rs is a thin shim.
 #
 # rlib only. The staticlib/cdylib types existed for Tauri mobile, which Android no
-# longer uses — it is a native Kotlin client over `thoughtsync-core` instead
+# longer uses — it is a native Kotlin client over `inkwell-core` instead
 # (Scribe note 2730), and the .so it loads is built from that crate, not this one.
 [lib]
-name = "thoughtsync_desktop_lib"
+name = "inkwell_desktop_lib"
 crate-type = ["rlib"]
 
-# The shipped command is `thoughtsync` on every install channel, and the binary's
+# The shipped command is `inkwell` on every install channel, and the binary's
 # own name is what the desktop actually keys on: GTK derives the window's WM_CLASS
 # from it, and Tauri's generated .desktop file sets StartupWMClass to that same
 # name. (Written without braces on purpose: `tauri android init` round-trips this
 # file through a TOML serializer that reformats brace tokens inside comments.)
 # So the canonical name has to be carried by the build target itself, not just by
-# the path it gets installed to (issue 2075). The crate stays `thoughtsync-desktop`
-# — only the executable is renamed. `thoughtsync` is also fixed under kebab-casing,
-# which the AppImage bundler applies to the binary name on its way in.
+# the path it gets installed to (issue 2075). The crate is `inkwell-desktop`, so
+# the executable is named here rather than inferred. `inkwell` is also fixed under
+# kebab-casing, which the AppImage bundler applies to the binary name on its way in.
 [[bin]]
-name = "thoughtsync"
+name = "inkwell"
 path = "src/main.rs"
 
 [build-dependencies]
@@ -50,7 +50,7 @@ tauri-build = { version = "2", features = [] }
 [dependencies]
 # The framework-free client core: local SQLite store + sync engine. Shared with the
 # Android client, which binds the same crate through uniffi (Scribe note 2730).
-thoughtsync-core = { path = "../../core" }
+inkwell-core = { path = "../../core" }
 
 tauri = { version = "2", features = [] }
 serde = { workspace = true }