Revert the desktop hotkey: a new crate needs a Cargo.lock this machine cannot write

`42e06da` added `tauri-plugin-global-shortcut` to Cargo.toml without updating
Cargo.lock, and every cargo invocation in CI passes `--locked`. Both desktop
jobs failed on the same line before compiling anything:

    error: cannot update the lock file ... because --locked was passed

So this says nothing about whether the code is right — clippy never ran. The
gate did exactly its job.

There is no Rust toolchain on this workstation (rule 10 — CI verifies), and a
lockfile is the one artifact CI is deliberately forbidden to generate. Hand-
writing the entries is not a real option: it needs the exact checksum and the
whole transitive tree, and a wrong checksum fails harder than a missing one.

Reverted rather than left red, because a red `dev` blocks everything behind it
and the Android half of #1899 is green and unaffected at c8318c3. The work is
intact in 42e06da and comes back with `git revert 5e0c...` once the lockfile
exists — nothing here needs rewriting.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K3MMqUtzX1TJgA1oypvm1c

desktop/src-tauri/capabilities/default.json

@@ -1,7 +1,7 @@
 {
   "$schema": "../gen/schemas/desktop-schema.json",
   "identifier": "default",
-  "description": "Core capability for the ThoughtSync windows: the board and the quick-capture window.",
-  "windows": ["main", "capture"],
+  "description": "Core capability for the main ThoughtSync window.",
+  "windows": ["main"],
   "permissions": ["core:default"]
 }