…ration test compile error

The "resolving a live thread collapses it" test was not exercising the actual
live-thread code path — it added an agent reply but never called
/api/agent/request, so comment.live was always false. Now calls the endpoint
to properly set live state and asserts the .live-thread CSS class.

Adds light theme axe-core contrast test to catch regressions like the
--fg-on-accent bug. Replaces waitForTimeout(100) with waitForFunction.

Fixes shareFile struct literal in TestShareSyncOrphanedFile — the Orphaned
field doesn't exist on shareFile (orphaned status is conveyed via Status:
"removed"). This was a compile error only visible with -tags integration.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Replaces the mock-based TestShareSyncOrphanedFile with a real end-to-end
test that shares an orphaned file (with line and file-level comments) to
a running crit-web instance and verifies both files and comments appear
correctly via the document and comments APIs.

Uses shareFilesToWeb directly rather than the CLI, since orphaned files
are shared via the browser share path (LoadShareFilesFromDisk on a live
session), not the CLI `crit share` command.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…lock

The wrapper element uses class 'comment-block', not 'comment-wrapper'.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>