feat: redesign chat transcript + fix streaming/persistence lifecycle — v0.50.70 (PR #587 by @aronprins)

Redesign chat transcript + fix streaming/persistence lifecycle — v0.50.70

Squash-merges PR #587 by @aronprins (Aron Prins). Full credit to @aronprins for all feature and fix work.

Transcript redesign: unified --msg-rail/--msg-max CSS variables, user turns as tinted cards, thinking cards as bordered panels, error card treatment, day-change separators, composer fade.

Approval/clarify as composer flyouts: cards slide up from behind composer top, overflow:hidden + translateY clip prevents travel visibility, focus({preventScroll:true}).

Streaming lifecycle: DOM order user→thinking→tool cards→response, no mid-stream jump. Live tool cards inserted before [data-live-assistant].

Persistence: reasoning attached before s.save(), _restore_reasoning_metadata on reload, role=tool rows preserved in S.messages, CLI-session tool-result fallback.

Workspace panel FOUC fix: [data-workspace-panel] set at parse time.

Docs: docs/ui-ux/index.html + two-stage-proposal.html.

Maintainer additions (433b867): CHANGELOG v0.50.70, version badge, usage badge loop simplification.

Reviewed and approved by @nesquena (independent review). 1361 tests passing.

static/boot.js

@@ -40,6 +40,7 @@ function _setWorkspacePanelMode(mode){
   if(!layout||!panel)return;
   _workspacePanelMode=(mode==='browse'||mode==='preview')?mode:'closed';
   const open=_workspacePanelMode!=='closed';
+  document.documentElement.dataset.workspacePanel=open?'open':'closed';
   // Persist open/closed across refreshes (browse/preview → open; closed → closed)
   localStorage.setItem('hermes-webui-workspace-panel', open ? 'open' : 'closed');
   layout.classList.toggle('workspace-panel-collapsed',!open);