feat(web): summarization-mode UI — all-videos list, Summarize queue, mode toggle

The list now shows ALL videos (ListVideos), not just summaries. Summarized cards
are unchanged; discovered-but-unsummarized videos render with a muted "pending"
treatment and either a "Summarize" button or a "Queued" chip.

- POST /v/{videoId}/summarize queues a video (RequestSummarize) and returns the
  refreshed card — it does NOT run the engine inline; `tapir run` is the single
  summarization driver, which picks up the flag on its next pass.
- Account page gains an Automatic/Manual toggle (POST /account/summarize-mode →
  SetAutoSummarize), shown as the current mode with a one-click switch.
- Both new POSTs degrade without JS (redirect back); HTMX swaps the fragment.

VideoCard and summarizeModeControl are extracted templ fragments reused as the
HTMX swap targets. views_templ.go regenerated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/web/handlers.go

@@ -16,12 +16,19 @@ import (
 // the concrete *store.Store). *store.Store satisfies it; tests can substitute a
 // fake without a database.
 type Store interface {
-	ListSummaries(ctx context.Context, userID string, limit int) ([]store.SummaryRow, error)
+	ListVideos(ctx context.Context, userID string, limit int) ([]store.SummaryRow, error)
 	GetSummaryByVideo(ctx context.Context, userID, videoID string) (*store.SummaryRow, error)
+	GetVideoRow(ctx context.Context, userID, videoID string) (*store.SummaryRow, error)
 	ActionsFor(ctx context.Context, userID string, videoIDs []string) (map[string][]string, error)
 	SetAction(ctx context.Context, userID, videoID, action string) error
 	ClearAction(ctx context.Context, userID, videoID, action string) error
 
+	// Summarization mode: the per-user auto/manual toggle and the per-video
+	// manual queue (the "Summarize" button). The runner consumes the queue.
+	GetAutoSummarize(ctx context.Context, userID string) (bool, error)
+	SetAutoSummarize(ctx context.Context, userID string, enabled bool) error
+	RequestSummarize(ctx context.Context, userID, videoID string) error
+
 	// Account management (the /account page, disconnect, delete-account).
 	ConnectionsForUser(ctx context.Context, userID string) ([]store.Connection, error)
 	DeleteConnection(ctx context.Context, userID, provider string) error
@@ -76,6 +83,7 @@ func (a *App) Router() http.Handler {
 	app.HandleFunc("GET /{$}", a.handleList)
 	app.HandleFunc("GET /v/{videoId}", a.handleDetail)
 	app.HandleFunc("POST /v/{videoId}/action", a.handleAction)
+	app.HandleFunc("POST /v/{videoId}/summarize", a.handleRequestSummarize)
 	app.HandleFunc("GET /register", a.handleRegisterForm)
 	app.HandleFunc("POST /register", a.handleRegister)
 
@@ -84,6 +92,7 @@ func (a *App) Router() http.Handler {
 	app.HandleFunc("GET /account", a.handleAccount)
 	app.HandleFunc("POST /account/disconnect/{provider}", a.handleDisconnect)
 	app.HandleFunc("POST /account/delete", a.handleDeleteAccount)
+	app.HandleFunc("POST /account/summarize-mode", a.handleSummarizeMode)
 
 	// Web-initiated YouTube connect (ADR-006). Gated like every app route, so
 	// CurrentUserID is set and the connection binds to the authenticated user.
@@ -121,9 +130,9 @@ func (a *App) handleList(w http.ResponseWriter, r *http.Request) {
 		To:      q.Get("to"),
 	}
 
-	rows, err := a.Store.ListSummaries(r.Context(), userID, 0)
+	rows, err := a.Store.ListVideos(r.Context(), userID, 0)
 	if err != nil {
-		a.serverError(w, r, "list summaries", err)
+		a.serverError(w, r, "list videos", err)
 		return
 	}
 	rows = f.apply(rows)
@@ -199,6 +208,59 @@ func (a *App) handleAction(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, "/v/"+videoID, http.StatusSeeOther)
 }
 
+// handleRequestSummarize queues a video for manual summarization. It does NOT run
+// the engine inline — it only flips summarize_requested; the next `tapir run`
+// picks it up (the single summarization driver). For HTMX it returns the refreshed
+// card (now showing "Queued"); without JS it redirects back to the list.
+func (a *App) handleRequestSummarize(w http.ResponseWriter, r *http.Request) {
+	userID, ok := a.currentUserID(w, r)
+	if !ok {
+		return
+	}
+	videoID := r.PathValue("videoId")
+
+	err := a.Store.RequestSummarize(r.Context(), userID, videoID)
+	if errors.Is(err, store.ErrNotFound) {
+		http.NotFound(w, r)
+		return
+	}
+	if err != nil {
+		a.serverError(w, r, "request summarize", err)
+		return
+	}
+
+	if !isHTMX(r) {
+		http.Redirect(w, r, "/", http.StatusSeeOther)
+		return
+	}
+	row, err := a.Store.GetVideoRow(r.Context(), userID, videoID)
+	if err != nil {
+		a.serverError(w, r, "get video", err)
+		return
+	}
+	a.render(w, r, VideoCard(*row))
+}
+
+// handleSummarizeMode toggles the user's auto/manual summarization mode. The form
+// submits the desired new value (enabled=true|false). For HTMX it returns the
+// refreshed mode control; without JS it redirects back to the account page.
+func (a *App) handleSummarizeMode(w http.ResponseWriter, r *http.Request) {
+	userID, ok := a.currentUserID(w, r)
+	if !ok {
+		return
+	}
+	enabled := r.FormValue("enabled") == "true"
+	if err := a.Store.SetAutoSummarize(r.Context(), userID, enabled); err != nil {
+		a.serverError(w, r, "set summarize mode", err)
+		return
+	}
+	if !isHTMX(r) {
+		http.Redirect(w, r, "/account", http.StatusSeeOther)
+		return
+	}
+	a.render(w, r, summarizeModeControl(enabled))
+}
+
 // currentUserID returns the tapir user_id the registration gate resolved for this
 // request. Behind the gate it is always present; a miss means a handler was
 // reached without scoping (a wiring bug), so it answers 500 and reports false.