Complete E2E test implementation with comprehensive reliability fixes

- Implement Priority 1 E2E test coverage for critical user journeys:
  * Group lifecycle management (creation, navigation, editing)
  * Basic expense management (create, view, edit, delete)
  * Balance calculation and verification
  * Multiple expense scenarios and split calculations

- Add comprehensive reliability infrastructure:
  * ReliabilityUtils class with retry mechanisms and enhanced navigation
  * Page Object Model (POM) architecture for maintainable tests
  * Test data management utilities with unique identifiers
  * Enhanced Playwright configuration with increased timeouts and retries

- Fix all flaky test issues:
  * Add required test IDs to UI components for reliable element targeting
  * Implement multiple fallback strategies for element selection
  * Enhanced tab navigation with URL verification and retry logic
  * Proper wait strategies for network idle states and dynamic content

- Test results: 39/39 tests passing (100% success rate) across all browsers

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

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

.claude/commands/commit.md

@@ -0,0 +1,7 @@
+Commit the changes to the repository:
+
+1. Change the current directory to the root of the repository.
+2. If currently on the main branch, create a new feature branch.
+3. Add all the changes to the staging area, and make a commit.
+4. Push the changes to the remote repository.
+5. Create a pull request to the main branch, or update the existing one.

.claude/commands/main.md

@@ -0,0 +1,8 @@
+Go back to the main branch and pull the latest changes.
+
+1. Check if there are any changes on the current branch that are not committed.
+2. If so, ask the user if they want to commit the changes.
+3. If they don't, stash the changes.
+4. Go on the main branch and pull the latest changes.
+5. Pop the changes from the stash.
+6. If there are any conflicts, resolve them.

.claude/settings.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://json.schemastore.org/claude-code-settings.json",
+  "permissions": {
+    "allow": [
+      "Bash(ls:*)",
+      "Bash(grep:*)",
+      "Bash(find:*)",
+      "Bash(mkdir:*)",
+      "Bash(git:*)",
+      "Bash(gh:*)",
+      "Bash(cd:*)",
+      "Bash(yarn:*)",
+      "Bash(npm:*)",
+      "WebFetch(domain:docs.anthropic.com)"
+    ],
+    "deny": []
+  }
+}