chore: release 0.8.7

[astyfx]

Summary

Patch release 0.8.7, packaging PRs #114–#118 already merged to main.

Features

• Add a Settings toggle (Settings → Steer / Queue) as the primary on/off control for mid-turn steering, keeping the STAVE_ENABLE_MID_TURN_STEERING env var as a fallback; hide the steer option in chat input when the setting is off.
• Add an @lens prompt mention that injects live Lens browser state (URL, title, loading status) as retrieved context, with an @info:browser alias.
• Flatten the app shell (remove glassmorphism, add Fleet View + active-workspaces list, full-screen Settings, Amplify Link section, drag-to-reorder Information panel sections, markdown Notes).
• Add a "cover chat" display mode to Lens.

Fixes

• Redesign the Steer/Queue composer into a single morphing Send/Stop button; remove the floating "Adjust current work" button; add Esc-to-stop; restyle queued-turn cards.
• Interrupt the Claude provider turn as soon as ExitPlanMode is detected so plan-mode turns always reach a final state.
• Stabilize the @-mention autocomplete palette so it only closes on outside pointer-down clicks.

References

#114, #115, #116, #117, #118

Verification

• bun run typecheck — pass
• bun test — 1510 pass / 11 fail (all pre-existing on main before this release commit, unrelated to the version bump/changelog diff: 9 in provider-executable-resolution.test.ts documented as pre-existing in PR feat(settings): move mid-turn steering behind a Settings toggle #118, plus a push stream memory release timeout and a steerTurn enabled fixture mismatch in bridge-persistence-regression.test.ts — both confirmed to reproduce on main HEAD prior to this commit)

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