docs: add Trellis planning and project specs

.trellis/spec/big-question/index.md

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+# Common Issues and Solutions
+
+> Documented pitfalls discovered while building production Next.js fullstack applications.
+> These issues apply to any project using Next.js with PostgreSQL, Drizzle ORM, Tailwind CSS, and i18n.
+
+## Severity Levels
+
+| Level    | Description                                          |
+| -------- | ---------------------------------------------------- |
+| Critical | Build fails or data corruption                       |
+| Warning  | Degraded experience, workaround exists               |
+| Info     | Minor visual issue, easy to fix once identified      |
+
+---
+
+## Issue Index
+
+| Issue                                                            | Category         | Severity |
+| ---------------------------------------------------------------- | ---------------- | -------- |
+| [postgres-json-jsonb.md](./postgres-json-jsonb.md)               | Database/ORM     | Critical |
+| [sentry-nextintl-conflict.md](./sentry-nextintl-conflict.md)    | Plugin Conflicts | Critical |
+| [turbopack-webpack-flexbox.md](./turbopack-webpack-flexbox.md)   | Build System     | Warning  |
+| [webkit-tap-highlight.md](./webkit-tap-highlight.md)             | Mobile/CSS       | Info     |
+
+---
+
+## How to Contribute
+
+Found a new pitfall? Add it to this directory:
+
+1. Create a new `.md` file with a descriptive kebab-case name
+2. Follow the existing format: Problem, Root Cause, Solution, Key Takeaways
+3. Update this index table with the correct category and severity
+4. Include reproducible code examples whenever possible