fix: deepen opens the linked note, task list columns in "Alle Aufgaben", Whisper repeats, date field

- The deepen buttons of task rows and Kanban cards open an already linked note (accent colour)
  instead of creating another one; the server refuses a second note for a linked task as well.
- "Alle Aufgaben" uses each task's own list columns for the status selector, dot and detail.
- Whisper: send vad_filter (STT_VAD_FILTER, default on) and drop a verbatim repeated tail of
  sentences or words from the transcript.
- Task detail: narrower time field, wider date field in the desktop sidebar.

v0.37.2.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/voice.go

@@ -12,6 +12,7 @@ import (
 	"net/http"
 	"net/textproto"
 	"path"
+	"regexp"
 	"strings"
 	"sync"
 	"time"
@@ -173,6 +174,9 @@ func (s *Server) transcribe(ctx context.Context, audio []byte, filename, content
 		_ = mw.WriteField("language", lang)
 	}
 	_ = mw.WriteField("response_format", "json")
+	if s.cfg.Speech.VADFilter {
+		_ = mw.WriteField("vad_filter", "true")
+	}
 	if err := mw.Close(); err != nil {
 		return "", err
 	}
@@ -192,7 +196,62 @@ func (s *Server) transcribe(ctx context.Context, audio []byte, filename, content
 	if err := json.Unmarshal(raw, &out); err != nil {
 		return "", fmt.Errorf("unerwartete Antwort: %s", strings.TrimSpace(string(raw)))
 	}
-	return strings.TrimSpace(out.Text), nil
+	return dropRepeatedTail(strings.TrimSpace(out.Text)), nil
+}
+
+var sentenceRe = regexp.MustCompile(`[^.!?…]+[.!?…]*`)
+
+func normalizeSpeech(s string) string {
+	return strings.Trim(strings.ToLower(strings.Join(strings.Fields(s), " ")), " .,!?…;:-–")
+}
+
+// dropRepeatedTail removes what Whisper sometimes makes up at the end of longer recordings: sentences
+// it already wrote, repeated once more, or the last words echoed right after themselves.
+func dropRepeatedTail(text string) string {
+	for {
+		trimmed := dropOnce(text)
+		if trimmed == text {
+			return text
+		}
+		text = trimmed
+	}
+}
+
+func dropOnce(text string) string {
+	// Sentence level: the last k sentences occur in the same order earlier on
+	sentences := sentenceRe.FindAllStringIndex(text, -1)
+	norm := make([]string, len(sentences))
+	for i, loc := range sentences {
+		norm[i] = normalizeSpeech(text[loc[0]:loc[1]])
+	}
+	for k := len(norm) / 2; k >= 1; k-- {
+		tail := norm[len(norm)-k:]
+		if len(strings.Join(tail, " ")) < 15 {
+			continue
+		}
+		for start := 0; start+k <= len(norm)-k; start++ {
+			same := true
+			for j := 0; j < k; j++ {
+				if norm[start+j] != tail[j] || tail[j] == "" {
+					same = false
+					break
+				}
+			}
+			if same {
+				return strings.TrimSpace(text[:sentences[len(norm)-k][0]])
+			}
+		}
+	}
+	// Word level: the last n words (at least 6) directly repeat the n words before them
+	words := strings.Fields(text)
+	for n := len(words) / 2; n >= 6; n-- {
+		a := normalizeSpeech(strings.Join(words[len(words)-2*n:len(words)-n], " "))
+		b := normalizeSpeech(strings.Join(words[len(words)-n:], " "))
+		if a == b {
+			return strings.Join(words[:len(words)-n], " ")
+		}
+	}
+	return text
 }
 
 // checkVoice asks the Whisper server whether it is up and has the model.

internal/api/voice_tail_test.go

@@ -0,0 +1,20 @@
+package api
+
+import "testing"
+
+// Whisper sometimes repeats earlier sentences or the last words at the end of a longer recording.
+func TestDropRepeatedTail(t *testing.T) {
+	for _, tc := range []struct{ in, want string }{
+		{"Morgen den Filter wechseln. Dann die Heizung prüfen. Morgen den Filter wechseln.", "Morgen den Filter wechseln. Dann die Heizung prüfen."},
+		{"Erst einkaufen. Dann kochen. Danach abwaschen. Dann kochen. Danach abwaschen.", "Erst einkaufen. Dann kochen. Danach abwaschen."},
+		{"bitte die neue Version auf dem Server einspielen bitte die neue Version auf dem Server einspielen", "bitte die neue Version auf dem Server einspielen"},
+		// Nothing repeated, or only a short word: unchanged
+		{"Ja. Nein. Ja.", "Ja. Nein. Ja."},
+		{"Kauf Milch, Brot und Eier. Und Butter.", "Kauf Milch, Brot und Eier. Und Butter."},
+		{"", ""},
+	} {
+		if got := dropRepeatedTail(tc.in); got != tc.want {
+			t.Errorf("dropRepeatedTail(%q) = %q, want %q", tc.in, got, tc.want)
+		}
+	}
+}

internal/config/config.go

@@ -91,6 +91,7 @@ type SpeechConfig struct {
 	MaxParallel    int // transcriptions running at the same time; more wait in line
 	PerUserPerHour int
 	TimeoutSeconds int
+	VADFilter      bool // ask the Whisper server to skip silence (fewer made-up repetitions); speaches understands it
 }
 
 // Mode is "server", "browser" or "off". The demo never uses the server, so visitors cannot keep
@@ -270,6 +271,7 @@ func Load() *Config {
 			MaxParallel:    envInt("STT_MAX_PARALLEL", 1, 1, 32),
 			PerUserPerHour: envInt("STT_PER_USER_PER_HOUR", 60, 1, 100000),
 			TimeoutSeconds: envInt("STT_TIMEOUT_SECONDS", 120, 5, 3600),
+			VADFilter:      strings.ToLower(getEnv("STT_VAD_FILTER", "true")) != "false",
 		},
 		NotifyDigestMinutes: envInt("NOTIFY_DIGEST_MINUTES", 5, 1, 1440),
 		VAPIDPublicKey:      strings.TrimSpace(os.Getenv("VAPID_PUBLIC_KEY")),

internal/storage/thoughts.go

@@ -311,6 +311,12 @@ func (s *Store) UpdateThoughtTriage(userID, thoughtID, action, convertTo, target
 			convertedType = "task"
 		} else if convertTo == "document" {
 			isTask := thought.Status == domain.StatusKept || (thought.Status == domain.StatusConverted && thought.ConvertedType == "task")
+			// A task already linked to a note keeps that note; no second one
+			if isTask && thought.ConvertedType == "document_block" && thought.DocID != "" {
+				if doc, err := s.GetDocumentByID(userID, thought.DocID); err == nil && doc != nil {
+					return thought, nil
+				}
+			}
 			newStatus = domain.StatusConverted
 			convertedType = "document"
 			title := thought.Content