chore(deps): bump rusqlite to 0.40 workspace-wide (#916)

* chore(deps): bump rusqlite to 0.40 workspace-wide

Align root src-tauri and workspace crates on rusqlite 0.40 so libsqlite3-sys
resolves to a single version (fixes Dependabot #913 links conflict).

* chore(nix): refresh flake.lock for rustc 1.95 dev shell

libsqlite3-sys 0.38 (rusqlite 0.40) needs cfg_select; nixpkgs pin was on
rustc 1.94. Bump workspace MSRV to 1.95 to match.

src-tauri/Cargo.lock

@@ -2815,9 +2815,9 @@ dependencies = [
 
 [[package]]
 name = "libsqlite3-sys"
-version = "0.37.0"
+version = "0.38.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1f111c8c41e7c61a49cd34e44c7619462967221a6443b0ec299e0ac30cfb9b1"
+checksum = "a76001fb4daed01e5f2b518aac0b4dc592e7c734da63dbffcf0c64fa612a8d0c"
 dependencies = [
  "cc",
  "pkg-config",
@@ -4611,9 +4611,9 @@ dependencies = [
 
 [[package]]
 name = "rusqlite"
-version = "0.39.0"
+version = "0.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a0d2b0146dd9661bf67bb107c0bb2a55064d556eeb3fc314151b957f313bcd4e"
+checksum = "1b3492ea85308705c3a5cc24fb9b9cf77273d30590349070db42991202b214c4"
 dependencies = [
  "bitflags 2.11.1",
  "fallible-iterator",