aiti-msg-anchor

❝ Replying to the wrong person's words is more awkward than calling someone the wrong name. ❞

A persistent anchor banner at the top of the message window: each user input and the AI replies after it form a "turn segment"; as you scroll, the banner follows the turn segment where the top boundary of the current viewport sits — whichever input generated the content at the top of your screen, the banner shows that input (with index/total; clicking the banner smooth-scrolls to that input).

• Reference use: when a large chunk of output sits at the top and you can't tell which input it belongs to, the banner shows the corresponding input for reference (right-aligned to the end of the message column, temporarily standing in for the off-screen user input); the banner auto-hides when the anchor input is already visible on screen (if you can see the input, what's the point).
• Shows while scrolling, fades out 6s after scrolling stops (visible for 6s initially; afterwards scrolling wakes it).
• Pure frontend extension: works with the two DOM contracts shared with aiti-msg-nav ([data-chat-scroll] / [data-chat-msg-role]), zero server API; zero layout reads in scroll frames (cached positions + binary search); lazy loading/streaming changes rebuild via a throttled MutationObserver.
• Session title mode: with display.mode = title it shows the session title (the name; if absent, the session's first input — same source as the left session list title), passed through via the chatOverlay slot's currentSession.
• Known limitation: index/total are based on user messages rendered in the current DOM (the virtual list renders only the viewport window) — in large sessions total is "rendered" rather than full; click-to-jump also only works within the rendered range. A trade-off under the pure-frontend contract.

Feature management (extman)

feature	type	default	description
show.banner	boolean	on	master switch
display.mode	string	current	current=the user input the current viewport belongs to (scroll following); first=the session's first input; latest=the most recent input; title=session title
text.maxLen	string	140	banner text truncation length (characters)
display.title	boolean	on	show the session title line as the banner's first line
display.input	boolean	on	show the anchor input line as the second line
display.opacity	string	85	banner opacity (0-100)