perf(desktop): reduce CPU/GPU overhead in Tauri shell

- SSH monitor: adaptive polling 2s→10s after stabilization, cheap TCP
  probe before expensive SSH subprocess check
- SSH setup: exponential backoff in wait_for_master_ready and
  wait_local_forward_ready (250ms→2s cap)
- Health checks: exponential backoff (100ms→1s / 250ms→2s) instead of
  flat intervals
- Startup recovery poll: cap at 15 retries instead of infinite
- Remove webview log target in release builds (eliminates IPC overhead)
- Set global NO_PROXY env var at startup for all loopback addresses
- Remove reqwest::blocking feature; use raw TCP for sidecar shutdown and
  SSH health checks
- Disable pinch-to-zoom on macOS via WKWebView.setAllowsMagnification
- Add WebView2 browser args on Windows (proxy bypass + disable unused
  UI features)
- Add Cargo release profile: thin LTO, codegen-units=1, strip
- Extract apply_platform_window_config for consistent window setup
- Add vibrancy toggle in Appearance settings (macOS desktop only) with
  solid background fallback when disabled

packages/desktop/src-tauri/Cargo.lock

@@ -1212,7 +1212,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "07bbe89c50d7a535e539b8c17bc0b49bdb77747034daa8087407d655f3f7cc1d"
 dependencies = [
  "futures-core",
- "futures-sink",
 ]
 
 [[package]]
@@ -2533,6 +2532,16 @@ dependencies = [
  "objc2-core-foundation",
 ]
 
+[[package]]
+name = "objc2-javascript-core"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a1e6550c4caed348956ce3370c9ffeca70bb1dbed4fa96112e7c6170e074586"
+dependencies = [
+ "objc2",
+ "objc2-core-foundation",
+]
+
 [[package]]
 name = "objc2-osa-kit"
 version = "0.3.2"
@@ -2557,6 +2566,17 @@ dependencies = [
  "objc2-foundation",
 ]
 
+[[package]]
+name = "objc2-security"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "709fe137109bd1e8b5a99390f77a7d8b2961dafc1a1c5db8f2e60329ad6d895a"
+dependencies = [
+ "bitflags 2.11.0",
+ "objc2",
+ "objc2-core-foundation",
+]
+
 [[package]]
 name = "objc2-ui-kit"
 version = "0.3.2"
@@ -2581,6 +2601,8 @@ dependencies = [
  "objc2-app-kit",
  "objc2-core-foundation",
  "objc2-foundation",
+ "objc2-javascript-core",
+ "objc2-security",
 ]
 
 [[package]]
@@ -2608,6 +2630,8 @@ dependencies = [
  "anyhow",
  "base64 0.22.1",
  "log",
+ "objc2",
+ "objc2-web-kit",
  "reqwest 0.12.28",
  "serde",
  "serde_json",
@@ -3436,9 +3460,7 @@ checksum = "eddd3ca559203180a307f12d114c268abf583f59b03cb906fd0b3ff8646c1147"
 dependencies = [
  "base64 0.22.1",
  "bytes",
- "futures-channel",
  "futures-core",
- "futures-util",
  "http",
  "http-body",
  "http-body-util",