Spurious info log for the root `course` block in normalizeOutlineBlocks

[!NOTE]
This issue was investigated and written by Claude Code, at a maintainer's request. The maintainer noticed the log line while manually testing an unrelated change and asked Claude to look into it, but has not independently deep-dived beyond that check — so treat the analysis below as Claude's and worth a human sanity-check.

Summary

normalizeOutlineBlocks (src/courseware/data/utils.js) emits a spurious info-level "Unexpected course block type" page action for the root course block on every course-outline (sidebar) normalization — even though a course block is a normal, expected part of the blocks response.

Details

The switch (block.type) handles chapter, sequential/lock, and vertical. Its default case logs (utils.js:204):

Unexpected course block type: course with ID block-v1:...+type@course+block@course.  Expected block types are course, chapter, and sequential.

The course-blocks response includes the root course block, which no case handles, so it falls through to default. The message is self-contradictory: it flags course as "unexpected" while its own text lists course among the expected types (and the text also omits vertical/lock, which the switch does handle).

Impact

Low — info level, no functional effect. But it fires once per course-outline normalization, i.e. on essentially every courseware page load, polluting telemetry with a benign "unexpected" page action.

Provenance / scope

• Introduced in #1375 (course outline sidebar); it predates and is unrelated to the Redux → React Query migration (#1946). The path that emits it — the getCourseOutlineStructure thunk → normalizeOutlineBlocks — is still Redux and untouched by the migration (verified via git history: the logInfo line traces to #1375, and utils.js is unmodified on the migration branches).
• Standalone bug; not a sub-issue of the migration epic.

Suggested fix

Add a case 'course': that no-ops (the root block maps to no section/sequence/unit model), so it's skipped rather than logged. Optionally correct the default message to list the block types actually handled.

Start in src/courseware/data/utils.js at normalizeOutlineBlocks and inspect the switch handling course-outline block types. Ensure the root course block is skipped without emitting the unexpected-type info log, then verify that normal chapter, sequential/lock, and vertical handling remains unchanged. Check the default message against the block types handled by the switch.