fix(web): persist thinking, title sessions distinctly, and send follow-ups from the answer

Thinking disappeared on failure and never reached session storage. Keep the
sanitized chain on disk and on errors, and regroup the sidebar around reports,
charts, favorites, and dated history titles.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/DESIGN.md

@@ -152,7 +152,8 @@ The base unit is 4px. Tokens are `--space-1: 4px`, `--space-2: 8px`, `--space-3:
 - **Desktop:** 288px expanded by default at 1024px and above; 64px collapsed icon rail.
 - **Tablet:** 64px collapsed by default from 768px through 1023px; 240px when expanded.
 - **Mobile:** no icon rail; an off-canvas drawer uses `min(86vw, 320px)` and closes through its scrim or Escape.
-- **Collapsed content:** logo, new-chat action, one history expansion action, and account avatar. Individual sessions do not become indistinguishable repeated icons.
+- **Collapsed content:** logo, new-chat action, reports action, one history expansion action, and account avatar. Individual sessions do not become indistinguishable repeated icons.
+- **Expanded content:** new chat, my reports, chart list, favorites, then history. Empty untitled sessions stay off the history list. Pin is favorite; archive stays in the session menu.
 - **Scroll ownership:** header and footer remain fixed; `SidebarContent` is the sole sidebar scroll owner.
 - **Scrollbar:** `SidebarContent`, ordinary session `.conversation`, and the rectification house board use a quiet overlay scrollbar: transparent track, no `scrollbar-gutter`, and a 4px warm thumb mixed from `--color-ink`. The thumb stays transparent until hover or keyboard focus inside the scroller, then uses `color-mix(in srgb, var(--color-ink) 26%, transparent)`; thumb hover uses 40%. Increased contrast keeps the thumb visible; forced colors restore the system scrollbar.
 - **Motion:** Sidebar state changes are immediate on desktop, tablet, and mobile. The 44px trigger keeps one stable 18px sidebar glyph and never enters an intermediate scale or opacity state.
@@ -161,10 +162,10 @@ The base unit is 4px. Tokens are `--space-1: 4px`, `--space-2: 8px`, `--space-3:
 
 ### Message
 
-- **Variants:** assistant editorial text on canvas; user text on warm card surface; streaming; error.
+- **Variants:** assistant editorial text on canvas; user text on warm card surface; streaming; error. Streaming uses a timeline of completed steps plus the current step; the thinking body expands while streaming, collapses when answer text appears, and is stored with the assistant message.
 - **Identity:** every assistant message carries the 32px Jyotisha logo avatar; user messages stay visually lighter and avatar-free.
 - **Typography:** assistant body 16px with serif subheadings; user body 14px.
-- **Follow-up:** answers offer no suggested next questions. The composer is the only way to continue, because measured use of the suggestion chips was negligible against the vertical space and reading interruption they cost.
+- **Follow-up:** the latest settled consultation answer may offer two or three grounded next questions under that answer. Clicking one sends it in the current session. The composer never hosts suggestion chips. If the answer does not support a grounded continuation, nothing is shown.
 - **Motion:** new messages enter with a short opacity/translate transition only.
 
 ### Suggestion card
@@ -177,7 +178,7 @@ The base unit is 4px. Tokens are `--space-1: 4px`, `--space-2: 8px`, `--space-3:
 ### Product entrypoint card
 
 - **Structure:** the homepage daily-reading and birth-time cards are single native-button targets stretched across their article surface. Content remains semantic card copy; a compact action label and arrow sit at the lower right.
-- **Copy:** chat history shows only the public labels “深入看今日”, “生时校正”, or “再次校正”. Clicking the daily card starts a consultation session with that public label and waits for the model; it does not place the question in the composer. Private model instructions are selected by a closed entrypoint identifier and expanded only on the server.
+- **Copy:** chat history titles daily readings as “8月22日 · 今日节奏”, topic cards as “事业 · …”, and rectification as “生时校正 · 8月21日”. Clicking the daily card starts a consultation session immediately; it does not place the question in the composer. Private model instructions are selected by a closed entrypoint identifier and expanded only on the server.
 - **States:** default, whole-card hover, pressed, focus-visible, and disabled. The card surface—not an inner promotional button—carries the interaction feedback.
 - **Responsive:** cards stack below 768px without introducing a large nested button; the footer keeps supporting copy flexible and the action label on one line.
 - **Accessibility:** each card exposes exactly one native button with a descriptive accessible name, preserves a visible focus ring, and meets the full-card touch target.