Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/istanbul-reports/lib/html/insertion-text.js

@@ -0,0 +1,114 @@
+'use strict';
+/*
+ Copyright 2012-2015, Yahoo Inc.
+ Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
+ */
+function InsertionText(text, consumeBlanks) {
+    this.text = text;
+    this.origLength = text.length;
+    this.offsets = [];
+    this.consumeBlanks = consumeBlanks;
+    this.startPos = this.findFirstNonBlank();
+    this.endPos = this.findLastNonBlank();
+}
+
+const WHITE_RE = /[ \f\n\r\t\v\u00A0\u2028\u2029]/;
+
+InsertionText.prototype = {
+    findFirstNonBlank() {
+        let pos = -1;
+        const text = this.text;
+        const len = text.length;
+        let i;
+        for (i = 0; i < len; i += 1) {
+            if (!text.charAt(i).match(WHITE_RE)) {
+                pos = i;
+                break;
+            }
+        }
+        return pos;
+    },
+    findLastNonBlank() {
+        const text = this.text;
+        const len = text.length;
+        let pos = text.length + 1;
+        let i;
+        for (i = len - 1; i >= 0; i -= 1) {
+            if (!text.charAt(i).match(WHITE_RE)) {
+                pos = i;
+                break;
+            }
+        }
+        return pos;
+    },
+    originalLength() {
+        return this.origLength;
+    },
+
+    insertAt(col, str, insertBefore, consumeBlanks) {
+        consumeBlanks =
+            typeof consumeBlanks === 'undefined'
+                ? this.consumeBlanks
+                : consumeBlanks;
+        col = col > this.originalLength() ? this.originalLength() : col;
+        col = col < 0 ? 0 : col;
+
+        if (consumeBlanks) {
+            if (col <= this.startPos) {
+                col = 0;
+            }
+            if (col > this.endPos) {
+                col = this.origLength;
+            }
+        }
+
+        const len = str.length;
+        const offset = this.findOffset(col, len, insertBefore);
+        const realPos = col + offset;
+        const text = this.text;
+        this.text = text.substring(0, realPos) + str + text.substring(realPos);
+        return this;
+    },
+
+    findOffset(pos, len, insertBefore) {
+        const offsets = this.offsets;
+        let offsetObj;
+        let cumulativeOffset = 0;
+        let i;
+
+        for (i = 0; i < offsets.length; i += 1) {
+            offsetObj = offsets[i];
+            if (
+                offsetObj.pos < pos ||
+                (offsetObj.pos === pos && !insertBefore)
+            ) {
+                cumulativeOffset += offsetObj.len;
+            }
+            if (offsetObj.pos >= pos) {
+                break;
+            }
+        }
+        if (offsetObj && offsetObj.pos === pos) {
+            offsetObj.len += len;
+        } else {
+            offsets.splice(i, 0, { pos, len });
+        }
+        return cumulativeOffset;
+    },
+
+    wrap(startPos, startText, endPos, endText, consumeBlanks) {
+        this.insertAt(startPos, startText, true, consumeBlanks);
+        this.insertAt(endPos, endText, false, consumeBlanks);
+        return this;
+    },
+
+    wrapLine(startText, endText) {
+        this.wrap(0, startText, this.originalLength(), endText);
+    },
+
+    toString() {
+        return this.text;
+    }
+};
+
+module.exports = InsertionText;