chore(jetbrains): use IPGP snapshot

[kirillk]

What

• Use the public IntelliJ Platform Gradle Plugin 2.16.1-SNAPSHOT for the JetBrains plugin build.
• Add the Sonatype Central snapshots repository to plugin resolution.

Why

• The upstream IPGP split-mode improvements from Make split-mode IDE runs observable and one-command ready JetBrains/intellij-platform-gradle-plugin#2164 are now available in the published snapshot, and we need them before the next stable IPGP release.

Verification

• ./gradlew buildEnvironment --refresh-dependencies from packages/kilo-jetbrains confirmed org.jetbrains.intellij.platform:intellij-platform-gradle-plugin:2.16.1-SNAPSHOT.
• ./gradlew --refresh-dependencies tasks --all from packages/kilo-jetbrains succeeded and showed runIdeSplitMode.
• bun turbo typecheck passed during push.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• packages/kilo-jetbrains/gradle/libs.versions.toml
• packages/kilo-jetbrains/settings.gradle.kts

Previous Review Summary (commit 307c95e)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 307c95e)

Status: 2 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	1

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-jetbrains/gradle/libs.versions.toml	3	Mutable 2.16.1-SNAPSHOT makes future dependency refreshes non-deterministic.

SUGGESTION

File	Line	Issue
packages/kilo-jetbrains/settings.gradle.kts	10	Limit the Sonatype snapshots repository to the IntelliJ plugin artifacts group.

Files Reviewed (2 files)

• packages/kilo-jetbrains/gradle/libs.versions.toml - 1 issue
• packages/kilo-jetbrains/settings.gradle.kts - 1 issue

Fix these issues in Kilo Cloud

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_{Reviewed by gpt-5.4-20260305 · Input: 44.2K · Output: 4.5K · Cached: 181.3K}

_{Review guidance: REVIEW.md from base branch main}