Fix setSelectIndex method name typo in Dropdownlist

[donghwan-yu]

The selectIndex prop setter called comp.setselectIndex (lower-case 's'), which does not match the native binding setSelectIndex.

---

Summary by cubic

Fix Dropdownlist selectIndex handling and options rendering: call comp.setSelectIndex correctly and avoid a trailing newline in native setItems, so selection updates reach the native binding and no blank option appears.
Adds docs for Arc, GIF, and Tabs, and links them in the readme.

^{Written for commit bc9ad5f. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}

[cubic-dev-ai]

3 issues found across 4 files (changes from recent commits).

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="doc/component/Tabs.md">

<violation number="1" location="doc/component/Tabs.md:22">
P3: Typo: 'controll' should be 'control'</violation>
</file>

<file name="doc/component/GIF.md">

<violation number="1" location="doc/component/GIF.md:23">
P3: Import path `lvlgjs-ui` should be `lvgljs-ui` to match the declared package dependency in package.json. The transposition won't resolve at runtime since npm module resolution is exact. This is a pre-existing pattern in other docs; consider fixing them all while adding this new file.</violation>
</file>

<file name="doc/component/Arc.md">

<violation number="1" location="doc/component/Arc.md:42">
P3: The Arc usage example points readers at a misspelled package name, so copying it will fail module resolution. The repository dependency is `lvgljs-ui`, while this line uses `lvlgjs-ui`; updating the import keeps the new docs runnable.</violation>
</file>

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>

[cubic-dev-ai]

P3: The Arc usage example points readers at a misspelled package name, so copying it will fail module resolution. The repository dependency is lvgljs-ui, while this line uses lvlgjs-ui; updating the import keeps the new docs runnable.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At doc/component/Arc.md, line 42:

<comment>The Arc usage example points readers at a misspelled package name, so copying it will fail module resolution. The repository dependency is `lvgljs-ui`, while this line uses `lvlgjs-ui`; updating the import keeps the new docs runnable.</comment>

<file context>
@@ -0,0 +1,80 @@
+
+## Usage
+```jsx
+import { Arc } from 'lvlgjs-ui'
+import { useState } from 'react'
+
</file context>

[donghwan-yu]

@derekstavis Could you review this?