feat: config bundle export/import + Crashpad minidump capture

[andrewchumchal]

Summary

Two independent improvements:

1. Config Bundle — export/import a shareable .ocbundle file containing provider + MCP server config (secrets stripped).
2. Crashpad — enable Electron's built-in crash reporter so future renderer/GPU/main crashes write minidump files to disk, making them debuggable.

Changes

Config Bundle

packages/desktop/src/main/ipc.ts

• config:export-bundle handler: shows save dialog for .ocbundle/.json, strips apiKey from providers and headers/env from MCP servers, writes JSON
• config:import-bundle handler: shows open dialog, reads + validates the file, returns parsed ConfigBundle

packages/desktop/src/preload.ts

• Exposes window.api.config.exportBundle() and window.api.config.importBundle() via context bridge

packages/desktop/src/renderer/env.d.ts

• Adds both methods to the config namespace type

packages/desktop/src/shared/types.ts

• Local ConfigBundle declaration (mirrors core) until @openconduit/core is bumped to a version that includes it
• Consolidated duplicate import type statements to fix import/no-duplicates lint warning

Crashpad

packages/desktop/src/main.ts

• crashReporter.start({ submitURL: '', uploadToServer: false }) called before the first BrowserWindow is created — enables Crashpad for renderer, GPU and main processes
• render-process-gone handler now passes crashDumpsDir to fireTelemetryCrash

packages/desktop/src/main/store/settings.ts

• StoredCrash gains optional crashDumpsDir?: string field

packages/desktop/src/main/ipc.ts

• fireTelemetryCrash accepts optional extra: { crashDumpsDir? } and stores it alongside the crash record

Context

Crash that triggered the Crashpad work:

errorType: RendererCrash
errorMessage: Renderer process gone (crashed, exit 5)

Exit code 5 = RESULT_CODE_KILLED_BAD_MESSAGE — a native Chromium-level kill with no JS stack trace. Crashpad minidumps are required to diagnose this class of crash.