chore: remove dead code (59 unused files + ~125 unused exports) (#1835)

* chore: remove dead/unreferenced files across ui, vscode

Remove 59 unused source files (components, hooks, lib utils, stores,
barrels, and orphaned vscode github modules) that are not imported by
any entry-reachable code. Also drop a stale test mock for the removed
execCommands module.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* refactor: remove unused exported symbols (types, functions, consts, hooks)

Remove exported symbols whose identifier is referenced nowhere in the
repository (verified via repo-wide search), across ui types/contracts,
lib utilities, sync layer, stores, and components. Also drop the few
imports/private helpers orphaned by these removals.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* refactor: remove more unused exports (desktop, shortcuts, worktree, vscode)

Continue removing repo-wide unreferenced exported functions, consts and
types across lib/desktop, shortcuts, worktreeSessionCreator, sync, and
vscode gitService, with cascading orphaned helpers/imports cleaned up.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

* chore: add dead-code cleanup tooling

* refactor: checkpoint dead-code cleanup

* refactor: remove dead-code suppressions

---------

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>
Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

knip.json

@@ -0,0 +1,62 @@
+{
+  "$schema": "https://unpkg.com/knip@latest/schema.json",
+  "workspaces": {
+    ".": {
+      "entry": [
+        "scripts/**/*.{js,cjs,mjs,ts}"
+      ],
+      "project": [
+        "*.{js,cjs,mjs,ts}",
+        "scripts/**/*.{js,cjs,mjs,ts}"
+      ]
+    },
+    "packages/ui": {
+      "entry": [
+        "src/**/*.{test,spec}.{js,cjs,mjs,jsx,ts,tsx}",
+        "src/**/__tests__/**/*.{js,cjs,mjs,jsx,ts,tsx}"
+      ],
+      "project": [
+        "src/**/*.{ts,tsx}"
+      ]
+    },
+    "packages/web": {
+      "entry": [
+        "src/mobile-main.tsx",
+        "src/mini-chat-main.tsx",
+        "src/sw.ts",
+        "server/**/*.{test,spec}.{js,cjs,mjs}",
+        "src/**/*.{test,spec}.{ts,tsx}"
+      ],
+      "project": [
+        "bin/**/*.js",
+        "server/**/*.{js,mjs,cjs}",
+        "src/**/*.{ts,tsx}"
+      ]
+    },
+    "packages/electron": {
+      "entry": [
+        "main.mjs",
+        "preload.mjs",
+        "tray.mjs",
+        "ssh-manager.mjs",
+        "opencode-cwd.mjs",
+        "*.{test,spec}.{js,cjs,mjs}",
+        "scripts/**/*.{js,cjs,mjs}"
+      ],
+      "project": [
+        "*.{js,cjs,mjs}",
+        "scripts/**/*.{js,cjs,mjs}"
+      ]
+    },
+    "packages/vscode": {
+      "entry": [
+        "src/**/*.{test,spec}.{js,cjs,mjs,ts,tsx}",
+        "webview/**/*.{test,spec}.{js,cjs,mjs,ts,tsx}"
+      ],
+      "project": [
+        "src/**/*.{ts,tsx}",
+        "webview/**/*.{ts,tsx}"
+      ]
+    }
+  }
+}