feat: per-cell content fit (cover|contain|fill), default cover

- Migration adds layout_cells.fit column (default 'cover')
- LayoutCell type + mapper + repo accept/persist fit
- Bundle ships fit per cell
- Admin cell edit form: Fit dropdown with industry-default Cover
- Rust kiosk applies ContentFit::Cover|Contain|Fill per cell.fit

Cover = fill cell, crop overflow (industry default — Nx Witness etc)
Contain = letterbox, no crop
Fill = stretch, distort

kiosk/src/bundle.rs

@@ -47,8 +47,12 @@ pub struct BundleCell {
     pub web_url: Option<String>,
     pub html_content: Option<String>,
     pub cooling_timeout_seconds: Option<u32>,
+    #[serde(default = "default_fit")]
+    pub fit: String,
 }
 
+fn default_fit() -> String { "cover".to_string() }
+
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct BundleCamera {
     pub id: u32,

kiosk/src/ui.rs

@@ -256,7 +256,11 @@ fn render_bundle(window: &ApplicationWindow, bundle: KioskBundle, server_url: &s
                         let area = (cell.col_span * cell.row_span) as f32 / total_area;
                         if let Some((paintable, badge)) = ensure_warm(cam_id, cam, cell.stream_selector.as_deref(), area) {
                             let picture = Picture::for_paintable(&paintable);
-                            picture.set_content_fit(gtk::ContentFit::Contain);
+                            picture.set_content_fit(match cell.fit.as_str() {
+                                "contain" => gtk::ContentFit::Contain,
+                                "fill" => gtk::ContentFit::Fill,
+                                _ => gtk::ContentFit::Cover,
+                            });
                             picture.set_vexpand(true);
                             picture.set_hexpand(true);
                             // Wrap in Overlay so we can stack a stream-role badge on top

server/src/plugins/service-admin-http/routes-admin.ts

@@ -748,12 +748,16 @@ export function registerAdminRoutes(app: H3, deps: AdminDeps): void {
       entityIdRaw && String(entityIdRaw).trim() !== "" ? Number(entityIdRaw) : null;
     deps.repo.assignCellEntity(cellId, Number.isFinite(entityId) ? entityId : null);
 
-    // stream_selector + spans are still settable on the cell.
+    // stream_selector + spans + fit are still settable on the cell.
     const dimsPatch: Record<string, unknown> = {};
     const streamSelector = body?.["stream_selector"];
     if (streamSelector === "auto" || streamSelector === "main" || streamSelector === "sub") {
       dimsPatch["stream_selector"] = streamSelector;
     }
+    const fit = body?.["fit"];
+    if (fit === "cover" || fit === "contain" || fit === "fill") {
+      dimsPatch["fit"] = fit;
+    }
     const colSpanRaw = body?.["col_span"];
     const rowSpanRaw = body?.["row_span"];
     if (colSpanRaw != null && String(colSpanRaw).trim() !== "") {

server/src/plugins/service-store/mappers.ts

@@ -208,6 +208,7 @@ export function rowToLayoutCell(r: Row): LayoutCell {
     cooling_timeout_seconds: nn(r["cooling_timeout_seconds"]),
     options: j<Record<string, unknown>>(r["options"], {}),
     entity_id: nn(r["entity_id"]),
+    fit: (s(r["fit"]) || "cover") as "cover" | "contain" | "fill",
   };
 }
 

server/src/plugins/service-store/migrations.ts

@@ -596,4 +596,9 @@ export const MIGRATIONS: readonly MigrationEntry[] = [
     addColumnIfNotExists(db, "kiosks", "fan_rpm", "INTEGER");
     addColumnIfNotExists(db, "kiosks", "fan_pwm", "INTEGER");
   },
+
+  // ---- per-cell content fit (cover|contain|fill) ----
+  (db: DatabaseSync) => {
+    addColumnIfNotExists(db, "layout_cells", "fit", "TEXT NOT NULL DEFAULT 'cover'");
+  },
 ];

server/src/plugins/service-store/repository.ts

@@ -556,6 +556,7 @@ export class Repository {
     cooling_timeout_seconds?: number | null;
     options?: Record<string, unknown>;
     entity_id?: number | null;
+    fit?: "cover" | "contain" | "fill";
   }): LayoutCell {
     // Resolve content fields from the entity (if given). The legacy columns
     // remain populated for backward-compatible bundle generation.
@@ -574,8 +575,8 @@ export class Repository {
     }
 
     const result = this.prep(
-      `INSERT INTO layout_cells (layout_id, "row", col, row_span, col_span, content_type, camera_id, stream_selector, web_url, html_content, cooling_timeout_seconds, options, entity_id)
+      `INSERT INTO layout_cells (layout_id, "row", col, row_span, col_span, content_type, camera_id, stream_selector, web_url, html_content, cooling_timeout_seconds, options, entity_id, fit)
-       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
     ).run(
       input.layout_id,
       input.row,
@@ -590,6 +591,7 @@ export class Repository {
       input.cooling_timeout_seconds ?? null,
       J(input.options ?? {}),
       input.entity_id ?? null,
+      input.fit ?? "cover",
     );
     const id = Number(result.lastInsertRowid);
     void this.notify("layout_cells", "create", id);

server/src/shared/bundle.ts

@@ -41,6 +41,7 @@ export interface BundleCell {
   web_url: string | null;
   html_content: string | null;
   cooling_timeout_seconds: number | null;
+  fit: "cover" | "contain" | "fill";
 }
 
 export interface BundleLayout {
@@ -152,6 +153,7 @@ export function generateBundle(
           web_url: webUrl,
           html_content: htmlContent,
           cooling_timeout_seconds: c.cooling_timeout_seconds,
+          fit: c.fit,
         };
       }),
     };

server/src/shared/types.ts

@@ -187,6 +187,7 @@ export interface LayoutCell {
   cooling_timeout_seconds: number | null;
   options: Record<string, unknown>;
   entity_id: number | null;
+  fit: "cover" | "contain" | "fill";
 }
 
 export interface Kiosk {

server/src/web-templates/admin-pages.tsx

@@ -1610,6 +1610,15 @@ export function renderCell(
             </select>
           </div>
 
+          <div class="form-group">
+            <label>Fit</label>
+            <select name="fit" class="form-input">
+              <option value="cover" selected={c.fit === "cover"}>Cover (fill, crop overflow)</option>
+              <option value="contain" selected={c.fit === "contain"}>Contain (letterbox)</option>
+              <option value="fill" selected={c.fit === "fill"}>Fill (stretch)</option>
+            </select>
+          </div>
+
           <div class="form-group span-grid">
             <div>
               <label>Width</label>