fix: add .js extensions to relative imports so the plugin loads under ESM

[Robespierred0p]

Problem

On OpenCode 1.14.33, the published opencode-mobile plugin fails to load and never starts a tunnel. The OpenCode log shows:

ERROR service=plugin path=opencode-mobile@latest
  error=Cannot find module '.../dist/src/push/formatter'
  imported from '.../dist/index.js'
  failed to load plugin

This is why users see No tunnel URL found from /mobile — the plugin never actually loads.

Root cause

tsconfig.json uses "moduleResolution": "bundler", which allows the source to omit file extensions on relative imports and emits them unchanged (e.g. import { formatNotification } from "./src/push/formatter"). OpenCode loads plugins with strict ESM resolution, which requires explicit .js extensions, so every extensionless relative specifier throws ERR_MODULE_NOT_FOUND and the whole plugin fails to load.

dist/src/push/formatter.js exists in the published package — it just can't be resolved without the extension.

The src/cli/* files already use .js extensions; only the plugin runtime graph (reachable from index.ts) was affected.

Fix

Add .js extensions to all relative imports in the plugin runtime graph:

• index.ts
• src/push/{index,formatter,sender,token-store}.ts
• src/tunnel/{index,cloudflare,localtunnel,ngrok}.ts
• src/utils/index.ts
• src/proxy/index.ts

11 files, 30 lines. No behavior changes — only import specifiers.

Verification

After npm run build, loaded the built plugin into OpenCode 1.14.33 via the local plugins dir. The plugin now initializes cleanly (no module error), the serve-mode gate passes, the Cloudflare tunnel starts, and the QR/URL are generated:

[opencode-mobile] v1.4.0
[PushPlugin][Mobile] Initialized
[PushPlugin] isServeMode: true
[Tunnel] Auto-selecting Cloudflare (most secure)...
[Cloudflared] URL: https://<...>.trycloudflare.com

Suggested follow-up (not in this PR)

Consider switching tsconfig.json to "moduleResolution": "nodenext" so extensionless relative imports become compile-time errors and this class of bug can't regress.

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