Social bar position is a click-toggle, not a drag — the drag-snap misbehaved for shaky hands (snapped up but wouldn't come back down; jitter around the deadzone). Clicking the bar now flips it top/bottom via ToggleSocialBarPosition; SocialBarSnap and its units removed — 153 tests passing, 0 warnings

HANDOFF.md

@@ -7,30 +7,19 @@
 
 ## Session state (last updated: 2026-08-13)
 
-- **Branch:** `main`. TASK 4 **ship step 5.5 is implemented, tested, and staged for
-  commit** — the social bar bug-fix branch (drag snap + fediverse heal + the bar on
-  the live output). Uncommitted: the feature work, tests (+8 → 155), and the memory
-  updates in TASKS.md / ai.md / Services/index.md / this file. Next action is
-  `git add` + commit + push (feature + its memory docs in ONE commit, per the
-  working rules).
-- **Finished this session:** both reported bugs diagnosed to root cause and fixed;
-  compositor rendering of the social bar added per user approval.
-  - **Bug 1 — drag didn't snap:** `Canvas.SetTop` set a local value that permanently
-    overrides `{Binding SocialBarTop}`; the release-time snap could never win. Fixed
-    with `SocialBarSnap.Decide` (direction-snap during drag, ±6px deadzone) +
-    `bar.ClearValue(Canvas.TopProperty)` on release.
-  - **Bug 2 — Mastodon showed the generic honeycomb:** `@gramps@llamachile.tube`
-    had `Software = NULL` (nodeinfo only ever asked of the landing-page domain).
-    Fixed via subdomain probing (`mastodon.` → `social.` → … candidates, ~15s
-    budget), a load-time heal (`MainViewModel.HealFediverseSoftwareAsync`), and a
-    settable `SocialEntry.FediverseSoftware` that raises `LogoData`.
-  - **Compositor bar:** `Services/Compositor/SocialBarRenderer.cs` (new, WPF
-    RenderTargetBitmap → straight-alpha strip), `SceneCompositor` blits it above
-    the flash, `FramePump` gains a re-read-each-frame `socialBar:` seam,
-    `MainViewModel` owns the strip frame.
-- **Verified:** Windows-host build **0 warnings**; **155/155 tests passing**
-  (147 baseline + 8 new). Full commit contents pending.
+- **Branch:** `main`. TASK 4 **ship step 5.5** is **committed and pushed** (`ac60a26`,
+  "TASK 4 ship step 5.5: social bar bug fixes + bar on the live output").
+- **This session (follow-up):** the drag-snap from 5.5 failed in practice — it snapped
+  up but wouldn't come back down (jitter around the deadzone, per the user). **Superseded
+  by a click-toggle** (user decision, KISS): `MainWindow.SocialBar_MouseLeftButtonDown`
+  → `MainViewModel.ToggleSocialBarPosition()` flips the bar top ⇄ bottom; the bar rides
+  `{Binding SocialBarTop}` alone; `SocialBarSnap` + its 2 tests removed. Build 0 warnings,
+  **153 tests passing** (155 − 2 snap units). **Uncommitted:** this click-toggle change +
+  its memory corrections (TASKS.md / ai.md / HANDOFF). Next action: commit + push.
+- **Verified:** 0 warnings; 153/153 tests pass.
 - **Landmines:**
+  - Never set a local `Canvas.SetTop` on the social bar — a local value permanently
+    overrides `{Binding SocialBarTop}` (the `ClearValue` lesson from 5.5).
   - The pump reads the active scene on a background thread while the UI can still
     edit it — a concurrent-mutation exception is contained (logged + `Failed` +
     the pump stops), not a crash. The background thread + video pipeline is the
@@ -49,11 +38,11 @@
     integration test (a real `MainWindow`), which never goes live — keep it that way.
   - Sandbox can't reach outbound HTTPS — the subdomain-probe logic is verified via
     stub-handler tests only, not against the real `mastodon.llamachile.tube`.
-- **Next step:** commit + push ship step 5.5 (one commit incl. memory docs). Then
-  TASK 4 ship step 6 — health stats: bind `FramePump.HealthUpdated`
-  (bitrate/FPS/duration) into the bottom bar. Nothing else queued — do not expand
-  the task queue on your own. Optional, not queued: rewriting the healed entry's
-  `ProfileUrl` to `https://mastodon.llamachile.tube/@gramps` (user must say the word).
+- **Next step:** commit + push the click-toggle follow-up. Then TASK 4 ship step 6 —
+  health stats: bind `FramePump.HealthUpdated` (bitrate/FPS/duration) into the bottom
+  bar. Nothing else queued — do not expand the task queue on your own. Optional, not
+  queued: rewriting the healed entry's `ProfileUrl` to
+  `https://mastodon.llamachile.tube/@gramps` (user must say the word).
 
 - **Secret/DB/port facts live:** OAuth client id/secret in `Helpers/OAuthCredentials.cs`;
   OAuth session token in `Helpers/TokenStore.cs` (DPAPI → `%APPDATA%\ytLlive\ytLlive.auth`);