feat(web): add interactive Angular web UI dashboard and execution visualizer

Introduces the full-featured, modern Angular 19 web dashboard for ARTEMIS.
Provides real-time multimodal agent stream visualization, live device feeds,
interactive step inspection, task queue management, and model telemetry.

Key Features & UI Architecture:
- Workspace & Layout:
  * Split-pane responsive layout with draggable resizer bar for execution stream and chat/task panel.
  * Standalone Angular components powered by Signals and reactive computed state.
- Real-Time Multimodal Agent Stream:
  * SSE connection (/api/stream/:session_id) for live streaming of thoughts, actions, and tool calls.
  * Hierarchical phase grouping (Planning -> Execution -> Verification -> Summary).
  * Interactive step viewer with before/after screenshot overlays, coordinate pins, bounding boxes, and OCR text highlights.
  * Live planning loader, error diagnostics banner, retry status indicator, and token usage metrics.
- Task Queue & Chat Interface:
  * Goal submission with instant dispatch to backend runner (/api/run).
  * Active task queue tracker (running, pending queue in FIFO order, completed/failed historical sessions).
  * Session switcher with model info badges and Markdown notes viewer (e.g. task_plan.md).
- Floating Video Player & Live Stream:
  * Draggable, floating video player overlay for reviewing session recordings and live device feeds (/api/stream/device-live).
  * Playback controls: play/pause, seek scrubber, speed multipliers (0.5x - 4.0x), looping, and theater mode.
- Formatting & Parsing Utilities:
  * Android UI action formatter (tap, type, swipe, drag, keyevent, app launch).
  * Tool call formatter for ADB commands, note management, video inspection, and failure recovery.
  * Markdown parsing and milestone checklist rendering.

angular.json

@@ -0,0 +1,106 @@
+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "cli": {
+    "packageManager": "npm",
+    "analytics": false
+  },
+  "newProjectRoot": "projects",
+  "projects": {
+    "frontend": {
+      "projectType": "application",
+      "schematics": {
+        "@schematics/angular:component": {
+          "style": "scss"
+        }
+      },
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular-devkit/build-angular:application",
+          "options": {
+            "outputPath": "dist/frontend",
+            "index": "src/index.html",
+            "browser": "src/main.ts",
+            "polyfills": [
+              "zone.js"
+            ],
+            "tsConfig": "tsconfig.app.json",
+            "inlineStyleLanguage": "scss",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.scss"
+            ],
+            "scripts": []
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kB",
+                  "maximumError": "1MB"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "50kB",
+                  "maximumError": "100kB"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular-devkit/build-angular:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "frontend:build:production"
+            },
+            "development": {
+              "buildTarget": "frontend:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "extract-i18n": {
+          "builder": "@angular-devkit/build-angular:extract-i18n"
+        },
+        "test": {
+          "builder": "@angular-devkit/build-angular:karma",
+          "options": {
+            "polyfills": [
+              "zone.js",
+              "zone.js/testing"
+            ],
+            "tsConfig": "tsconfig.spec.json",
+            "inlineStyleLanguage": "scss",
+            "assets": [
+              {
+                "glob": "**/*",
+                "input": "public"
+              }
+            ],
+            "styles": [
+              "src/styles.scss"
+            ],
+            "scripts": []
+          }
+        }
+      }
+    }
+  }
+}