[Bug] Undocumented design reversal caused mobile regression without E2E testing

Bug Description
Claude Code reversed a documented design decision (popup→redirect) without flagging it, pushed code without running e2e tests, caused a mobile regression, and wasted significant time.

Environment Info

• Platform: linux
• Terminal: gnome-terminal
• Version: 2.1.114
• Feedback ID: ed1ebeb7-9ff0-4132-80f8-b0f00563a3b9

Errors

[{"error":"Error: Executable not found in $PATH: \"typescript-language-server\"\n    at spawn (unknown)\n    at spawn (node:child_process:667:35)\n    at spawn (node:child_process:14:39)\n    at start (/$bunfs/root/src/entrypoints/cli.js:3163:20884)\n    at O (/$bunfs/root/src/entrypoints/cli.js:3163:24867)\n    at Y (/$bunfs/root/src/entrypoints/cli.js:3163:30015)\n    at w (/$bunfs/root/src/entrypoints/cli.js:3163:30352)\n    at D (/$bunfs/root/src/entrypoints/cli.js:3163:30909)\n    at call (/$bunfs/root/src/entrypoints/cli.js:4781:1378)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:24:13.138Z"},{"error":"Error: Failed to start LSP server for file /home/mcornell/dev/crew-predictions/src/views/__tests__/MatchesView.test.ts: Executable not found in $PATH: \"typescript-language-server\"\n    at Y (/$bunfs/root/src/entrypoints/cli.js:3163:30041)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:24:13.138Z"},{"error":"Error: Executable not found in $PATH: \"typescript-language-server\"\n    at spawn (unknown)\n    at spawn (node:child_process:667:35)\n    at spawn (node:child_process:14:39)\n    at start (/$bunfs/root/src/entrypoints/cli.js:3163:20884)\n    at O (/$bunfs/root/src/entrypoints/cli.js:3163:24867)\n    at Y (/$bunfs/root/src/entrypoints/cli.js:3163:30015)\n    at w (/$bunfs/root/src/entrypoints/cli.js:3163:30352)\n    at D (/$bunfs/root/src/entrypoints/cli.js:3163:30909)\n    at call (/$bunfs/root/src/entrypoints/cli.js:4781:1378)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:24:13.138Z"},{"error":"McpToolCallError: ### Error\nError: browserBackend.callTool: Target page, context or browser has been closed\n    at ZX7 (/$bunfs/root/src/entrypoints/cli.js:4761:63)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:36:01.707Z"},{"error":"McpToolCallError: ### Error\nError: browserBackend.callTool: Target page, context or browser has been closed\n    at ZX7 (/$bunfs/root/src/entrypoints/cli.js:4761:63)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:36:07.345Z"},{"error":"McpToolCallError: ### Error\nError: browserBackend.callTool: Target page, context or browser has been closed\n    at ZX7 (/$bunfs/root/src/entrypoints/cli.js:4761:63)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:36:22.772Z"},{"error":"Error: LSP server plugin:typescript-lsp:typescript failed to start: Executable not found in $PATH: \"typescript-language-server\"\n    at start (/$bunfs/root/src/entrypoints/cli.js:3163:22348)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:55:44.336Z"},{"error":"Error: Executable not found in $PATH: \"typescript-language-server\"\n    at spawn (unknown)\n    at spawn (node:child_process:667:35)\n    at spawn (node:child_process:14:39)\n    at start (/$bunfs/root/src/entrypoints/cli.js:3163:20884)\n    at O (/$bunfs/root/src/entrypoints/cli.js:3163:24867)\n    at Y (/$bunfs/root/src/entrypoints/cli.js:3163:30015)\n    at w (/$bunfs/root/src/entrypoints/cli.js:3163:30352)\n    at D (/$bunfs/root/src/entrypoints/cli.js:3163:30909)\n    at call (/$bunfs/root/src/entrypoints/cli.js:4781:1378)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:55:44.336Z"},{"error":"Error: Failed to start LSP server for file /home/mcornell/dev/crew-predictions/src/__tests__/App.test.ts: Executable not found in $PATH: \"typescript-language-server\"\n    at Y (/$bunfs/root/src/entrypoints/cli.js:3163:30041)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:55:44.336Z"},{"error":"Error: Executable not found in $PATH: \"typescript-language-server\"\n    at spawn (unknown)\n    at spawn (node:child_process:667:35)\n    at spawn (node:child_process:14:39)\n    at start (/$bunfs/root/src/entrypoints/cli.js:3163:20884)\n    at O (/$bunfs/root/src/entrypoints/cli.js:3163:24867)\n    at Y (/$bunfs/root/src/entrypoints/cli.js:3163:30015)\n    at w (/$bunfs/root/src/entrypoints/cli.js:3163:30352)\n    at D (/$bunfs/root/src/entrypoints/cli.js:3163:30909)\n    at call (/$bunfs/root/src/entrypoints/cli.js:4781:1378)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T12:55:44.336Z"},{"error":"Error: LSP server plugin:typescript-lsp:typescript failed to start: Executable not found i…

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