fix(web): reviewer findings on Tasks board column model (task 1)

Finding 1 (Important): replace inline per-column sort comparators in
groupTasksByColumn with calls to the existing sortTasksByDate(tasks, descend)
helper. The old inline code fell back to epoch 0 for missing created_at,
sorting dateless tasks FIRST in ascending columns — diverging from the rest of
the codebase's convention (sortTasksByDate puts them LAST). Add two new tests
asserting that a task with no created_at sorts LAST in both an ascending
column (queue) and a descending column (interrupted).

Finding 2 (Important): revert web/test/tab-persistence.test.mjs — the two
'stories' assertions introduced in 54be094 were out of Task 1's scope and
belong to Task 2. Restore the original 'queue' assertions so commit messages
accurately reflect their contents; Task 2 will re-apply the fix intentionally.

Finding 3 (Minor): add the missing state-list uniqueness assertion to the
'every column key is unique' test: assert.equal(new Set(allStates).size,
allStates.length) so a state appearing in two columns is caught.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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