Add design docs for achievable status fix and course description popups change artifacts

openspec/changes/course-description-popups/proposal.md

@@ -0,0 +1,26 @@
+## Why
+
+Users selecting elective courses have no way to see course descriptions or instructor information within the app. They must cross-reference a separate PDF document to understand what each course covers. Adding inline course info popups reduces friction and helps users make more informed selections.
+
+## What Changes
+
+- Add a new data file mapping each course ID to its description text and instructor list, extracted from the J27 Electives PDF and supplementary sources
+- Add an info icon `(i)` next to each course name in the course selection UI
+- Clicking/tapping the info icon opens a popover displaying the course description and instructor(s)
+- Popover closes on click outside, clicking the icon again, or pressing Escape
+- Works identically on desktop and mobile (no hover/long-press distinction)
+
+## Capabilities
+
+### New Capabilities
+- `course-info-popover`: Inline popover UI triggered by an info icon on each course, displaying course description and instructor(s) from a static data source
+
+### Modified Capabilities
+
+## Impact
+
+- New file: `app/src/data/courseDescriptions.ts` — static data (~35 course entries with descriptions and instructor arrays)
+- Modified: `app/src/data/types.ts` — no changes needed (data lives in separate lookup, not on Course type)
+- Modified: `app/src/components/CourseSelection.tsx` — add info icon and popover component
+- No solver, state, or worker changes
+- No new dependencies