add new form field, improved indexing, update libs and readme

[kegren]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds a new NumberField form component, improves database query performance with indexes on the todos table, updates dependencies, and rewrites the README with better documentation.

Key changes:

• Added NumberField component for numeric form inputs with min/max/step validation
• Added database indexes on todo table for userId, createdAt, and a composite index on userId + completed
• Updated .env.example with new environment variables for useSend, OAuth providers, and NODE_ENV
• Rewrote README with Railway deployment instructions and improved project documentation
• Updated landing page with new tech stack badges and feature highlights
• Bumped versions of better-auth, react-email, and TanStack packages

Issues found:

• Environment variable naming mismatch: .env.example defines USESEND_EMAIL_FROM but env.ts expects USESEND_FROM_EMAIL
• Breaking change: EMAIL_FROM was renamed to USESEND_FROM_EMAIL in env schema, but send-email.ts still references the old env.EMAIL_FROM property

Confidence Score: 2/5

• This PR has a breaking bug in the email configuration that will cause runtime errors when sending emails.
• The environment variable renaming introduced inconsistencies: .env.example uses a different name than env.ts, and send-email.ts still references the old property name. This will cause TypeScript errors and runtime failures.
• src/lib/server/env.ts and .env.example need attention to fix the environment variable naming mismatch.

Important Files Changed

Filename	Overview
.env.example	Added new environment variables for useSend, OAuth providers, and NODE_ENV. Contains a naming mismatch: USESEND_EMAIL_FROM should be USESEND_FROM_EMAIL to match env.ts.
README.md	Complete rewrite with improved documentation, deployment instructions for Railway, and updated project structure.
bun.lock	Dependency updates for better-auth, react-email components, tanstack form/query packages.
package.json	Standard dependency version bumps.
src/components/form/number-field.tsx	New form field component for number inputs with min/max/step support and validation state handling.
src/db/schema/todos.ts	Added database indexes for userId, createdAt, and a composite index on userId+completed for better query performance.
src/hooks/form.ts	Added NumberField to the form hook's fieldComponents registry.
src/lib/server/env.ts	Renamed EMAIL_FROM to USESEND_FROM_EMAIL, made USESEND_API_KEY required, added USESEND_BASE_URL. Breaking: send-email.ts still references old env.EMAIL_FROM.
src/routes/index.tsx	Updated landing page with new tech stack badges and feature highlights. UI-only changes.

Sequence Diagram

sequenceDiagram
    participant User
    participant Form
    participant NumberField
    participant Database
    participant EmailService
    
    Note over Form,NumberField: New NumberField Component
    User->>Form: Enter numeric value
    Form->>NumberField: Render with min/max/step
    NumberField->>Form: handleChange(Number(value))
    
    Note over Database: Improved Indexing
    Database->>Database: index(userId)
    Database->>Database: index(createdAt)
    Database->>Database: index(userId, completed)
    
    Note over EmailService: ⚠️ Broken Reference
    EmailService->>EmailService: env.EMAIL_FROM (undefined!)
    EmailService--xUser: Error: Property not found

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[greptile-apps]

_{8 files reviewed, 2 comments}

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[greptile-apps]

syntax: Environment variable name mismatch: .env.example uses USESEND_EMAIL_FROM but src/lib/server/env.ts expects USESEND_FROM_EMAIL. This will cause the app to fail at startup.

Suggested change

	USESEND_EMAIL_FROM=
	USESEND_FROM_EMAIL=

Prompt To Fix With AI

This is a comment left during a code review.
Path: .env.example
Line: 7:7

Comment:
**syntax:** Environment variable name mismatch: `.env.example` uses `USESEND_EMAIL_FROM` but `src/lib/server/env.ts` expects `USESEND_FROM_EMAIL`. This will cause the app to fail at startup.

```suggestion
USESEND_FROM_EMAIL=
```

How can I resolve this? If you propose a fix, please make it concise.

[greptile-apps]

logic: This env variable was renamed from EMAIL_FROM to USESEND_FROM_EMAIL, but src/lib/email/send-email.ts:22 still references env.EMAIL_FROM. This will cause a TypeScript error and runtime failure when sending emails.

Prompt To Fix With AI

This is a comment left during a code review.
Path: src/lib/server/env.ts
Line: 10:10

Comment:
**logic:** This env variable was renamed from `EMAIL_FROM` to `USESEND_FROM_EMAIL`, but `src/lib/email/send-email.ts:22` still references `env.EMAIL_FROM`. This will cause a TypeScript error and runtime failure when sending emails.

How can I resolve this? If you propose a fix, please make it concise.