Add copy-only, color swatches, DB speed pragmas, and living docs

- Copy only (right-click -> Copy): write to clipboard without
  auto-pasting or hiding the window
- Color swatches: hex/rgb/hsl entries show a preview chip
- SQLite WAL + synchronous=NORMAL so the UI can read while the
  clipboard poller writes
- Memoize list rows (React.memo) so selection/focus changes don't
  re-render every row's preview
- Add docs/GUIDE.md (living install + usage doc), docs/SHARING.md,
  docs/TESTING.md, docs/LAUNCH-AT-LOGIN.md, docs/PRODUCT.md,
  CHANGELOG.md, ROADMAP.md
- Add homelab Gitea Actions CI (.gitea/workflows/ci.yml) + gitleaks
  allowlist
- Bump version to 0.2.0

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "macopy"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 
 [lib]
@@ -26,10 +26,14 @@ base64 = "0.22"
 log = "0.4"
 png = "0.17"
 dirs = "5"
+regex = "1"
 tokio = { version = "1", features = ["time", "macros", "process"] }
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-graphics = "0.24"
+objc2 = "0.6"
+objc2-app-kit = { version = "0.3", features = ["NSPasteboard"] }
+objc2-foundation = { version = "0.3", features = ["NSString"] }
 
 [features]
 custom-protocol = ["tauri/custom-protocol"]