## Why
The Inbox surface was briefly renamed to **Activity** during #2045 and
picked up a bell icon to match. The name was reverted to **Inbox**
before merge, but the icon was not.
A bell says "notification tray." Inbox is a destination — a focused,
conversation-oriented place to catch up on work relevant to you,
including drafts and reminders that have nothing to do with
notifications. The glyph should say that.
## What changed
- Swap the sidebar entry from Lucide `Bell` to Lucide `Inbox`.
- Assert the icon in `inbox-refactor-screenshots.spec.ts`. Nothing
pinned it before, which is exactly how it drifted through a rename.
This also brings desktop back in line with mobile, which already uses
`LucideIcons.inbox300` / `inbox500` for the same destination.
## Deliberately unchanged
The bell on **reminder** rows in the list pane (`InboxListPane.tsx`,
reminders → bell, drafts → file) stays. A bell is the right glyph for a
reminder; that one was never about the surface's identity.
## Verification
- The new assertion is a real guard, not a no-op: with `Bell` restored
the test fails with `Expected: 1, Received: 0` on `svg.lucide-inbox`.
Confirmed before committing.
- `biome` and `tsc` clean.
- Playwright smoke: `inbox-refactor-screenshots` 4 passed; `smoke`,
`navigation`, `channels`, `sidebar-more-unread-overlap`,
`home-collapsed-top-chrome`, `workspace-rail` — 107 passed, 1 skipped.
- Screenshot below is the regenerated `02-current-controls` shot from
the spec.
Signed-off-by: Clay Delk <clay.delk@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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