I1: move cog registration + tree.sync into ChorusBot.setup_hook (called once
before gateway connect) instead of on_ready (fires on every reconnect),
preventing duplicate cogs/listeners/poll loops after a gateway RESUME.
I2 (email_ingest.py, addressed alongside I1 for IMAP stability): none here,
handled separately.
I3/I4: TriageList.vue now renders a follow_up_date column so it actually
surfaces back to Donna. App.vue adds a "Show completed" checkbox bound to
includeDone, matching what docs/smoke-test.md step 7 already describes.
I5: add frontend/tests/ItemModal.spec.js covering stagesForType() options
for donation/other/unset types and the type-change stage reset regression.
I6: App.vue wraps loadItems/openItem in try/catch with a calm (no-panic)
error message, and shows calm empty-state copy when there are zero items.
Also fixes thread_ingest.py: standalone threads not started from a message
raise discord.NotFound on fetch_message; now caught and returns early.
stagesForType() returned OTHER_STAGES (including 'done') for the unset
type case, but backend stages.py::valid_stages_for(None) only allows
['new'] when type is unset. This let the UI offer 'Done' as a stage
option with no type selected, which the backend rejects with 422.
Also add a watch on type that resets stage to 'new' when the current
stage is no longer valid for the newly selected type, preventing a
stale invalid stage from being silently submitted.
