Remove the title field — a note is named by its first line

Operator (note 2897): "notes shouldn't have a title field." The concept of a NAME
stays — search results, export filenames and the command palette all need one —
but nothing is typed into it any more. `display_title` is now the first non-empty
line of the body, falling back to the first checklist item.

That fallback is what step 2 bought, and the reason this could not go first: a
checklist had no body to be named from, so the title was its only name. Now every
note has a body, and a note that is only a checklist is named by its first item.

Gone everywhere: the column and note_revisions.title (0026), the field on the
core's Note/NoteCreateInput/NoteRevision and its SQLite columns (user_version 7),
`normalize_title`, the wire field, the FFI record and `NoteEdit::Title` /
`ClearTitle`, the web editor's "Title (optional)" input and the card's <h3>, and
the Android title field in both the compose sheet and the editor.

**The search vector had to be rebuilt, not just left alone.** `notes.search_vector`
is a STORED GENERATED column whose expression names `title` — Postgres refuses to
drop a column another generated column depends on. It is dropped and recreated over
`display_title` at weight A, which keeps the original intent: a note's NAME ranks
above the rest of its body.

**An imported title becomes the note's first body line.** Keep notes carry one, and
so does any ThoughtSync export taken before this. Dropping it would silently lose
text someone wrote; folding it in puts it exactly where a name now lives, so the
note arrives named as it was. Skipped when the body already opens with that line,
so re-importing an export this code produced doesn't stack duplicates.

Two smaller things fell out. The Android editor loses its bold first field — one
weight throughout, because the first line is the note's name but not a different
KIND of text, which is most of step 4 arriving early. And `ClearTitle`'s
justification comment moved to `ClearRemindAt`, which is now the surviving example
of why NoteEdit is a list rather than a struct of options.

Protocol note corrected to say what actually shipped: v2 is "no kind, no title",
one bump for the pair.

Verified with the local Rust gate this time, not by CI: fmt, clippy and 116 tests
all green before pushing. It caught four things — orphaned serde attributes where
fields were removed, a `wire::Preview.title` I deleted by mistake (a link preview
still has one), nine retention fixtures inserting a dropped column, and four
rustfmt diffs.

android/app/src/main/java/com/fabledsword/thoughtsync/MainActivity.kt

@@ -226,8 +226,8 @@ private fun App(
                 ComposeSheet(
                     saving = board.state.saving,
                     onDismiss = { composing = false },
-                    onSave = { title, content ->
-                        board.create(title, content)
+                    onSave = { content ->
+                        board.create(content)
                         composing = false
                     },
                 )

android/app/src/main/java/com/fabledsword/thoughtsync/ui/BoardViewModel.kt

@@ -194,19 +194,15 @@ class BoardViewModel(
      * Blank input is ignored rather than rejected: an empty save is a slip, not a
      * mistake worth interrupting someone over.
      */
-    fun create(
-        title: String,
-        content: String,
-    ) {
-        val cleanTitle = title.trim()
+    fun create(content: String) {
         val cleanContent = content.trim()
-        if (cleanTitle.isEmpty() && cleanContent.isEmpty()) return
+        if (cleanContent.isEmpty()) return
 
         viewModelScope.launch {
             state = state.copy(saving = true)
             state =
                 try {
-                    val created = withContext(Dispatchers.IO) { core.createNote(draft(cleanTitle, cleanContent)) }
+                    val created = withContext(Dispatchers.IO) { core.createNote(draft(cleanContent)) }
                     // Prepend rather than reload: the new note belongs at the top
                     // of the board, and a full re-query would cost a round trip to
                     // tell us what we already know. Skipped when the board is not
@@ -277,28 +273,10 @@ class BoardViewModel(
             EditorAction.Close -> state = state.copy(editing = null)
             EditorAction.DismissError -> dismissError()
 
-            // Text is the only edit that batches: title and body are typed
-            // together and saved together on close, so they cost one write and
-            // one revision snapshot rather than two of each.
+            // Saved on close rather than per keystroke, so a session of typing
+            // costs one write and one revision snapshot.
             is EditorAction.SaveText ->
-                mutate {
-                    it.updateNote(
-                        id,
-                        listOf(
-                            // An emptied title CLEARS the column rather than
-                            // storing "". The core derives `display_title` from
-                            // the first body line when the title is null, so the
-                            // difference is whether an untitled note is nameable
-                            // or blank — exactly what `ClearTitle` exists for.
-                            if (action.title.isBlank()) {
-                                NoteEdit.ClearTitle
-                            } else {
-                                NoteEdit.Title(action.title.trim())
-                            },
-                            NoteEdit.Body(action.body),
-                        ),
-                    )
-                }
+                mutate { it.updateNote(id, listOf(NoteEdit.Body(action.body))) }
 
             is EditorAction.SetColor -> edit(id, NoteEdit.Color(action.color))
 
@@ -464,12 +442,8 @@ private fun query(
     labelId: String? = null,
 ) = NoteQuery(view = view, labelId = labelId, sort = null, facets = null)
 
-private fun draft(
-    title: String,
-    content: String,
-): NoteDraft =
-    // Body carries the text; the core derives display_title from its first line when
-    // no title was given, so a captured thought is nameable without making the user
-    // name it. A checklist is added afterwards, in the editor — it is something a note
-    // HAS, not a different thing to capture (M13 step 2).
-    NoteDraft(title = title, body = content, color = DEFAULT_COLOR, items = null)
+private fun draft(content: String): NoteDraft =
+    // The core names the note from the body's first line, so a captured thought is
+    // findable without anyone being asked to name it. A checklist is added afterwards,
+    // in the editor — it is something a note HAS, not a different thing to capture.
+    NoteDraft(body = content, color = DEFAULT_COLOR, items = null)

android/app/src/main/java/com/fabledsword/thoughtsync/ui/ComposeSheet.kt

@@ -57,27 +57,26 @@ import com.fabledsword.thoughtsync.R
 fun ComposeSheet(
     saving: Boolean,
     onDismiss: () -> Unit,
-    onSave: (String, String) -> Unit,
+    onSave: (String) -> Unit,
 ) {
     val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
     // Saveable, not just remembered: a rotation mid-sentence is the same lost
     // thought as a discarded one, and it was losing it before this.
-    var title by rememberSaveable { mutableStateOf("") }
     var content by rememberSaveable { mutableStateOf("") }
     val contentFocus = remember { FocusRequester() }
 
-    val written = title.isNotBlank() || content.isNotBlank()
-    val leave = { if (written) onSave(title, content) else onDismiss() }
+    val written = content.isNotBlank()
+    val leave = { if (written) onSave(content) else onDismiss() }
 
-    // Land in the body, not the title. Most captures are a thought, not a titled
-    // document, and making someone tab past an optional field is the difference
-    // between "under a second" and not.
+    // Straight into the one field there is. A capture is a thought, and every field
+    // someone has to tab past is the difference between "under a second" and not —
+    // which is why the title field is gone rather than merely skipped (M13 step 3).
     LaunchedEffect(Unit) { contentFocus.requestFocus() }
 
     // Backgrounding PERSISTS but does not close an empty sheet. Someone who tapped
     // + and then got distracted should find the composer where they left it; the
     // only reason to act here is that there is something to lose.
-    FlushOnStop { if (written) onSave(title, content) }
+    FlushOnStop { if (written) onSave(content) }
 
     ModalBottomSheet(onDismissRequest = leave, sheetState = sheetState) {
         Column(
@@ -91,13 +90,6 @@ fun ComposeSheet(
         ) {
             // No note/list switch any more: there is one thing to capture. A
             // checklist is added to a note in the editor, once there is a note.
-            PlainTextField(
-                value = title,
-                onValueChange = { title = it },
-                hint = R.string.compose_title_hint,
-                singleLine = true,
-            )
-
             PlainTextField(
                 value = content,
                 onValueChange = { content = it },
@@ -109,7 +101,7 @@ fun ComposeSheet(
             SheetActions(
                 canSave = !saving && written,
                 onDiscard = onDismiss,
-                onSave = { onSave(title, content) },
+                onSave = { onSave(content) },
             )
         }
     }

android/app/src/main/java/com/fabledsword/thoughtsync/ui/EditorAction.kt

@@ -22,7 +22,6 @@ sealed interface EditorAction {
     data object DismissError : EditorAction
 
     data class SaveText(
-        val title: String,
         val body: String,
     ) : EditorAction
 

android/app/src/main/java/com/fabledsword/thoughtsync/ui/NoteCard.kt

@@ -21,7 +21,6 @@ import androidx.compose.ui.draw.clip
 import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontStyle
-import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
@@ -50,21 +49,9 @@ fun NoteCard(
                 .border(1.dp, tint.border(dark), RoundedCornerShape(CARD_RADIUS))
                 .padding(12.dp),
     ) {
-        // A title only renders when one was actually set. `displayTitle` is
-        // derived from the first body line when it wasn't, so printing both would
-        // show the same text twice.
-        note.title?.takeIf { it.isNotBlank() }?.let { title ->
-            Text(
-                text = title,
-                style = MaterialTheme.typography.titleSmall,
-                fontWeight = FontWeight.SemiBold,
-                maxLines = 2,
-                overflow = TextOverflow.Ellipsis,
-            )
-            Spacer(Modifier.height(4.dp))
-        }
-
-        // Both, in order — a note can carry a body AND a checklist (M13 step 2).
+        // Body then checklist, in order — a note can carry both (M13 step 2), and
+        // nothing above them: the first line of the body IS the note's name, at the
+        // same weight as the rest of it (M13 steps 3 and 4).
         if (note.body.isNotBlank()) {
             Text(
                 text = note.body,
@@ -78,9 +65,9 @@ fun NoteCard(
             Checklist(items = note.items)
         }
 
-        // A note with no title, no body and no items still has to occupy the
-        // board legibly — otherwise it reads as a rendering bug.
-        if (note.title.isNullOrBlank() && note.body.isBlank() && note.items.isEmpty()) {
+        // A note with no body and no items still has to occupy the board legibly —
+        // otherwise it reads as a rendering bug.
+        if (note.body.isBlank() && note.items.isEmpty()) {
             Text(
                 text = stringResource(R.string.board_empty_note),
                 style = MaterialTheme.typography.bodyMedium,

android/app/src/main/java/com/fabledsword/thoughtsync/ui/NoteEditorScreen.kt

@@ -30,7 +30,6 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import com.fabledsword.thoughtsync.R
 import com.fabledsword.thoughtsync.core.Label
@@ -62,7 +61,6 @@ fun NoteEditorScreen(
 
     // Keyed by note id: the editor is reused across notes, and without the key the
     // second note opened would show the first one's text.
-    var title by remember(note.id) { mutableStateOf(note.title.orEmpty()) }
     var body by remember(note.id) { mutableStateOf(note.body) }
     var picker by remember(note.id) { mutableStateOf(Picker.NONE) }
     var confirmingDelete by remember(note.id) { mutableStateOf(false) }
@@ -77,8 +75,8 @@ fun NoteEditorScreen(
     // would bump `updated_at`, mark the note dirty for sync, and snapshot a
     // revision identical to the one before it.
     val flush = {
-        if (!readOnly && (title != note.title.orEmpty() || body != note.body)) {
-            onAction(EditorAction.SaveText(title, body))
+        if (!readOnly && body != note.body) {
+            onAction(EditorAction.SaveText(body))
         }
     }
     val leave = {
@@ -142,14 +140,9 @@ fun NoteEditorScreen(
                 ErrorBanner(message = message, onDismiss = { onAction(EditorAction.DismissError) })
             }
 
-            EditorField(
-                value = title,
-                onValueChange = { title = it },
-                hint = R.string.editor_title_hint,
-                enabled = !readOnly,
-                bold = true,
-            )
-
+            // One field. A note is its body; its NAME is that body's first line, so
+            // there is nothing separate to type into and nothing to render bolder
+            // than the line beneath it (M13 steps 3 and 4).
             EditorField(
                 value = body,
                 onValueChange = { body = it },
@@ -252,11 +245,15 @@ private fun EditorOverlays(
 }
 
 /**
- * The title and body fields.
+ * The note's body field.
  *
  * Undecorated, via the shared [PlainTextField]: the screen is already painted in
  * the note's colour, and a filled field would draw a second surface over the first
  * and turn a note into a form.
+ *
+ * One weight throughout. The first line is the note's name, but it is not a
+ * different KIND of text from the line after it, and typing it should not feel like
+ * filling in a header.
  */
 @Composable
 private fun EditorField(
@@ -264,7 +261,6 @@ private fun EditorField(
     onValueChange: (String) -> Unit,
     @StringRes hint: Int,
     enabled: Boolean,
-    bold: Boolean = false,
     minLines: Int = 1,
 ) {
     PlainTextField(
@@ -272,16 +268,8 @@ private fun EditorField(
         onValueChange = onValueChange,
         hint = hint,
         enabled = enabled,
-        // The title is one line by contract — it is a name, and a name that wraps
-        // has become a body. The body itself never is.
-        singleLine = bold,
         minLines = minLines,
-        textStyle =
-            if (bold) {
-                MaterialTheme.typography.titleLarge.copy(fontWeight = FontWeight.SemiBold)
-            } else {
-                MaterialTheme.typography.bodyLarge
-            },
+        textStyle = MaterialTheme.typography.bodyLarge,
     )
 }