feat(browser): CDP screencast with canvas rendering and element inspector

Replaces native webview with Playwright CDP Page.startScreencast that
streams JPEG frames to a canvas element. Full interactivity via CDP
Input.dispatch events. Element inspector injects hover overlay and
extracts outerHTML + computed CSS on click, attached to composer.
Works with any site — no iframe or native webview limitations.

Author: Swofty-Developments

Cargo.lock

@@ -7,7 +7,7 @@ edition.workspace = true
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
-tauri = { version = "2", features = ["unstable", "devtools"] }
+tauri = { version = "2", features = [] }
 tauri-plugin-dialog = "2"
 tauri-plugin-shell = "2"
 codeforge-session = { path = "../session" }
@@ -21,4 +21,3 @@ uuid = { workspace = true }
 chrono = { workspace = true }
 anyhow = { workspace = true }
 rusqlite = "0.31"
-url = "2"