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* feat(chat): Chat V2 — sidebar entry + main-area page Replace the floating drawer + FAB with a first-class workspace route `/:slug/chat`. Sidebar gets a single `Chat` entry under Inbox with an unread dot; session history lives inside the Chat tab via a popover rather than leaking into the global sidebar (keeps Multica's "nouns in the nav" semantic — Inbox / Issues / Projects are work objects, Chat is a tool). - Add `paths.workspace(slug).chat()` + update link-handler route set. - New `ChatPage` view with PageHeader, history popover, centered messages/composer column, and empty-state starter prompts. - Delete `ChatWindow`, `ChatFab`, resize helpers, and standalone `ChatSessionHistory` (history now embedded in the popover). - Drop `isOpen`/`toggle`/`showHistory`/resize fields from `useChatStore` — the page is a route now, not an overlay. - Wire the new `/chat` route on web (App Router) and desktop (react-router + tab-store icon mapping). Addresses MUL-1322. * fix(chat): align composer width with message column The ChatPage wrapper added px-4 on top of ChatInput's own px-5, making the composer 32px narrower than the messages column. Drop the outer px-4 so both share the same max-w-3xl outer + px-5 inner padding provided by ChatMessageList / ChatInput. * fix(chat): taller default composer (~3 lines visible, 8 max) min-h 4rem → 7rem, max-h 10rem → 15rem. Empty state previously showed only 1 text row after pb-9 for the action bar; raise the floor so there's visible writing room and lift the ceiling so a longer draft can grow before scrolling kicks in. * fix(chat): restore anchor + in-flight indicator + cold-start session restore Three issues surfaced by review: 1. ContextAnchorButton always disabled on /:slug/chat — useRouteAnchorCandidate only matches issue/project/inbox pathnames, so moving chat to its own route dropped 'bring the page I was on into the conversation'. Track the last anchor-eligible location globally (new useAnchorTracker mounted in AppSidebar + lastAnchorLocation on useChatStore) and substitute it when on /chat. 2. No global 'Multica is working' cue after ChatFab deletion. Subscribe the sidebar Chat entry to pendingChatTasksOptions and swap the unread dot for a spinner while any chat task is in flight. 3. ChatPage restore effect latched didRestoreRef before the sessions query resolved, so cold-start direct nav to /chat landed on the empty state even when the server had an active session. Wait for isSuccess before locking the ref. * fix(chat): clear lastAnchorLocation on workspace rehydration The pathname captured in workspace A would otherwise be reused against workspace B's wsId, triggering a cross-workspace issue/project fetch and silently leaking anchor context into chat messages. --------- Co-authored-by: Lambda <f252c2c5-7d1d-4f3c-b394-a61abfe673fc@users.noreply.multica.ai>