fix(desktop): export tail of oversized logs in debug bundle

[Hona]

The debug bundle silently dropped the one file that matters.

• collect skipped any file over 50 MB. The V2 server appends to opencode.log with no rotation, so on a long-lived install the active server log is the largest file in the directory and gets excluded.
• The bundle then only contained a stale opencode-local.log from a different (idle) server, making the export useless for diagnosing the current session.
• Oversized files now contribute their last 50 MB instead of being skipped. manifest.json lists them under truncated so the reader knows the head is missing.

flowchart LR
  A[stat file] --> B{size > 50 MB?}
  B -- no --> C[readFile]
  B -- yes --> D["stream(path, { offset: size - 50 MB })"]
  C --> E[zip entry]
  D --> E
  D --> F["manifest.truncated[]"]

Loading

// packages/desktop/src/main/native/logging.ts
const offset = Math.max(0, Number(info.size) - MAX_EXPORT_FILE_SIZE)
return { name, path: file, offset }

// writeZip
entry.offset === 0
  ? yield* fs.readFile(entry.path)
  : Buffer.concat(yield* Stream.runCollect(fs.stream(entry.path, { offset: entry.offset })))

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.