Per-conv streaming state, immediate message_count commit, auto-new-chat on open

stores/chat.ts:
- Replace 7 global stream refs with convStreams: Record<number, ConvStreamState>
- Each conversation tracks its own stream state; 7 names become computed getters
- Add isStreamingConv(id) public helper
- Increment message_count +2 immediately after POST 202 (not at done) so the
  cleanup watcher never deletes a mid-generation conversation
- SSE reconnect retries now run for background conversations regardless of
  which conv is currently viewed
- error toasts only shown when the erroring conv is currently viewed
- deleteConversation cleans up orphaned stream state

ChatView.vue:
- Remove invalid write to store.lastContextMeta (now a read-only computed)
- Add !store.isStreamingConv(newId) guard to watch(convId) fetch so navigating
  back to a generating conversation shows accumulated content without stale refetch
- Add startNewConversation() helper; opening /chat with no ID auto-creates a
  new conversation and redirects to it (on mount and on navigation)
- Deleting a conversation also auto-creates a new one

Also committing previous-session changes (keyboard nav + task routing):
- App.vue: e shortcut only on note-view (not task-view, which is removed)
- TaskCard.vue: route directly to /tasks/:id (viewer), remove View buttons
- router/index.ts: remove task-view route; /tasks/:id now maps to TaskEditorView
- TasksListView.vue: Enter key pushes to /tasks/:id

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

summary.md

@@ -12,7 +12,13 @@
 >    Include file-level details in the commit body when the change is non-trivial.
 
 ## Last Updated
-2026-03-04 — Keyboard navigation overhaul: `e` to edit on viewer pages; `/` to focus search bar (custom event dispatch); `c` to focus chat on home / navigate to chat elsewhere; `j`/`k` vim-style list navigation with visual highlight in Notes and Tasks flat views; `Enter` opens selected item; `a:focus-visible` CSS rule added so router-link cards show visible focus outlines; `SearchBar.vue` exposes `focus()` via `defineExpose`; shortcuts panel updated with Lists and Chat sections. Also in this session: Task cards route directly to edit view; TaskViewerView added sub-task list with progress bar and inline status cycling; NoteViewerView shows project/milestone/parent breadcrumb; Dashboard shows Active Projects in tasks column (2-per-row), 50/50 column layout, overflow fixed with `overflow-x: clip` + `min-width: 0` on all page containers.
+2026-03-04 — Per-conversation streaming state + auto-new-chat on open.
+
+**Chat store refactor (`stores/chat.ts`):** Replaced 7 global stream refs (`streaming`, `streamingContent`, `streamingThinking`, `streamingToolCalls`, `streamingStatus`, `streamingPendingTool`, `lastContextMeta`) with a single `convStreams: Record<number, ConvStreamState>` map. Each conversation now tracks its own stream state independently. Public API is unchanged — the 7 names are now computed getters derived from the current conversation's slot. Added `isStreamingConv(id)` helper. Key behaviour changes: `message_count` is incremented by 2 immediately after POST 202 (not at `done`) so the cleanup watcher never deletes a conversation that is mid-generation; SSE reconnect retries now run regardless of which conversation is currently viewed (background streams persist); `error` toasts only shown when viewing that conversation; `deleteConversation` cleans up orphaned stream state.
+
+**ChatView.vue:** Removed invalid write to `store.lastContextMeta` (now a read-only computed). Added `!store.isStreamingConv(newId)` guard to the `watch(convId)` fetch so navigating back to a generating conversation shows accumulated content without a stale refetch. Added `startNewConversation()` helper; opening `/chat` with no ID now automatically creates a new conversation and redirects to it (both on mount and when navigating to `/chat` from elsewhere). Deleting a conversation also auto-creates a new one.
+
+**Previous session (same date):** Keyboard navigation overhaul: `e` to edit on viewer pages; `/` to focus search bar; `c` to focus chat on home / navigate to chat elsewhere; `j`/`k` vim-style list navigation; `Enter` opens selected item; `a:focus-visible` focus-ring rule. Task cards route directly to `/tasks/:id` (edit view); `task-view` route removed; `TasksListView` `Enter` key updated accordingly. `TaskViewerView` sub-task list with progress bar and inline status cycling; `NoteViewerView` project/milestone/parent breadcrumb; Dashboard Active Projects, 50/50 layout, overflow fixes.
 
 ## Project Overview
 Fabled Assistant is a self-hosted note-taking and task-tracking application with