Prompt Saver widget for Windows

Code Review

Review this code for correctness, edge cases and readability. Point out anything that would fail under concurrent use, and suggest the smallest change that fixes each problem.

Bug Fix Helper

Help me debug this. Start from the stack trace, name the most likely cause, and tell me the one experiment that would confirm or rule it out.

Documentation

Write documentation for this module: what it is for, the two or three things a caller has to know, and one worked example. No marketing.

Unit Tests

Generate unit tests covering the happy path, the boundary values and the failure modes. Prefer a handful of tests that would actually catch a regression over exhaustive coverage.