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.lock

@@ -1965,7 +1965,11 @@ dependencies = [
  "dirs 5.0.1",
  "hex",
  "log",
+ "objc2",
+ "objc2-app-kit",
+ "objc2-foundation",
  "png 0.17.16",
+ "regex",
  "rusqlite",
  "serde",
  "serde_json",
@@ -2156,10 +2160,17 @@ checksum = "d49e936b501e5c5bf01fda3a9452ff86dc3ea98ad5f283e1455153142d97518c"
 dependencies = [
  "bitflags 2.11.1",
  "block2",
+ "libc",
  "objc2",
+ "objc2-cloud-kit",
+ "objc2-core-data",
  "objc2-core-foundation",
  "objc2-core-graphics",
+ "objc2-core-image",
+ "objc2-core-text",
+ "objc2-core-video",
  "objc2-foundation",
+ "objc2-quartz-core",
 ]
 
 [[package]]
@@ -2179,6 +2190,7 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b402a653efbb5e82ce4df10683b6b28027616a2715e90009947d50b8dd298fa"
 dependencies = [
+ "bitflags 2.11.1",
  "objc2",
  "objc2-foundation",
 ]
@@ -2239,6 +2251,19 @@ dependencies = [
  "objc2-core-graphics",
 ]
 
+[[package]]
+name = "objc2-core-video"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d425caf1df73233f29fd8a5c3e5edbc30d2d4307870f802d18f00d83dc5141a6"
+dependencies = [
+ "bitflags 2.11.1",
+ "objc2",
+ "objc2-core-foundation",
+ "objc2-core-graphics",
+ "objc2-io-surface",
+]
+
 [[package]]
 name = "objc2-encode"
 version = "4.1.0"
@@ -2262,6 +2287,7 @@ checksum = "e3e0adef53c21f888deb4fa59fc59f7eb17404926ee8a6f59f5df0fd7f9f3272"
 dependencies = [
  "bitflags 2.11.1",
  "block2",
+ "libc",
  "objc2",
  "objc2-core-foundation",
 ]