feat(tailscale): add Tailscale control center widget (#1875)

* feat(tailscale): add Tailscale control center widget

Full-stack Tailscale integration for DMS control center:

Backend (Go):
- Event-driven manager via WatchIPNBus (no polling)
- Reconnects with exponential backoff when tailscaled unavailable
- Typed conversion from ipnstate.Status to QML-friendly IPC types
- Testable via tailscaleClient interface with mock watcher
- Manager cleanup in cleanupManagers()
- 19 unit tests

Frontend (QML):
- TailscaleService with WebSocket subscription
- TailscaleWidget with peer list, filter chips, search
- Copy-to-clipboard for IPs and DNS names
- Daemon lifecycle handling (offline/stopped states)

Dependencies:
- Add tailscale.com v1.96.1 (official local API client)
- Bump Go to 1.26.1 (required by tailscale.com)

* cleanups

---------

Co-authored-by: bbedward <bbedward@gmail.com>

core/go.mod

@@ -1,8 +1,6 @@
 module github.com/AvengeMedia/DankMaterialShell/core
 
-go 1.26.0
-
-toolchain go1.26.1
+go 1.26.1
 
 require (
 	github.com/Wifx/gonetworkmanager/v2 v2.2.0
@@ -23,34 +21,52 @@ require (
 	github.com/yuin/goldmark v1.8.2
 	github.com/yuin/goldmark-highlighting/v2 v2.0.0-20230729083705-37449abec8cc
 	go.etcd.io/bbolt v1.4.3
+	go4.org/mem v0.0.0-20240501181205-ae6ca9944745
 	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f
 	golang.org/x/image v0.39.0
+	tailscale.com v1.96.1
 )
 
 require (
+	filippo.io/edwards25519 v1.2.0 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/ProtonMail/go-crypto v1.4.1 // indirect
+	github.com/akutz/memconn v0.1.0 // indirect
 	github.com/clipperhouse/displaywidth v0.11.0 // indirect
 	github.com/clipperhouse/uax29/v2 v2.7.0 // indirect
 	github.com/cloudflare/circl v1.6.3 // indirect
+	github.com/coder/websocket v1.8.12 // indirect
 	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
+	github.com/dblohm7/wingoes v0.0.0-20240119213807-a09d6be7affa // indirect
 	github.com/dlclark/regexp2 v1.12.0 // indirect
 	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/fogleman/gg v1.3.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
 	github.com/go-git/gcfg/v2 v2.0.2 // indirect
 	github.com/go-git/go-billy/v6 v6.0.0-20260424211911-732291493fb8 // indirect
+	github.com/go-json-experiment/json v0.0.0-20250813024750-ebf49471dced // indirect
 	github.com/go-logfmt/logfmt v0.6.1 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/hdevalence/ed25519consensus v0.2.0 // indirect
+	github.com/jsimonetti/rtnetlink v1.4.0 // indirect
 	github.com/kevinburke/ssh_config v1.6.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/mdlayher/netlink v1.7.3-0.20250113171957-fbb4dce95f42 // indirect
+	github.com/mdlayher/socket v0.5.0 // indirect
+	github.com/mitchellh/go-ps v1.0.0 // indirect
 	github.com/pjbgf/sha1cd v0.5.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/sergi/go-diff v1.4.0 // indirect
 	github.com/stretchr/objx v0.5.3 // indirect
+	github.com/tailscale/go-winio v0.0.0-20231025203758-c4f33415bf55 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
 	github.com/yeqown/reedsolomon v1.0.0 // indirect
+	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba // indirect
 	golang.org/x/crypto v0.50.0 // indirect
 	golang.org/x/net v0.53.0 // indirect
 	golang.org/x/sync v0.20.0 // indirect
+	golang.zx2c4.com/wireguard/windows v0.5.3 // indirect
 )
 
 require (
@@ -61,7 +77,7 @@ require (
 	github.com/charmbracelet/x/ansi v0.11.7 // indirect
 	github.com/charmbracelet/x/cellbuf v0.0.15 // indirect
 	github.com/charmbracelet/x/term v0.2.2 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/go-git/go-git/v6 v6.0.0-alpha.2
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
@@ -72,7 +88,7 @@ require (
 	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0
-	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/spf13/afero v1.15.0
 	github.com/spf13/pflag v1.0.10 // indirect