feat(layout): introduce dees-tile component for unified tile layout

ts_web/elements/00group-layout/dees-tile/dees-tile.demo.ts

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+import { html, css, cssManager } from '@design.estate/dees-element';
+import './dees-tile.js';
+
+export const demoFunc = () => {
+  return html`
+    <dees-demowrapper>
+      <style>
+        ${css`
+          .demoBox {
+            background: ${cssManager.bdTheme('hsl(0 0% 95%)', 'hsl(0 0% 9%)')};
+            padding: 40px;
+            display: flex;
+            flex-direction: column;
+            gap: 24px;
+          }
+          .tile-demo-content {
+            position: absolute;
+            inset: 0;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            color: ${cssManager.bdTheme('hsl(0 0% 45%)', 'hsl(0 0% 55%)')};
+            font-size: 13px;
+          }
+          .footer-stats {
+            display: flex;
+            align-items: center;
+            gap: 24px;
+            font-size: 11px;
+            width: 100%;
+          }
+          .footer-stats .stat {
+            display: flex;
+            align-items: center;
+            gap: 6px;
+          }
+          .footer-stats .stat strong {
+            color: ${cssManager.bdTheme('hsl(0 0% 15%)', 'hsl(0 0% 90%)')};
+          }
+        `}
+      </style>
+      <div class="demoBox">
+        <dees-tile heading="Simple Tile" style="height: 200px;">
+          <div class="tile-demo-content">Content area with rounded corners</div>
+        </dees-tile>
+
+        <dees-tile heading="Tile with Footer" style="height: 200px;">
+          <div class="tile-demo-content">Content goes here</div>
+          <div slot="footer" class="footer-stats">
+            <span class="stat">latest <strong>42</strong></span>
+            <span class="stat">min <strong>12</strong></span>
+            <span class="stat">max <strong>87</strong></span>
+            <span class="stat">avg <strong>45.3</strong></span>
+          </div>
+        </dees-tile>
+
+        <dees-tile style="height: 200px;">
+          <div slot="header" style="display:flex;align-items:center;gap:12px;width:100%;">
+            <span style="font-weight:500;">Custom Header</span>
+            <input type="text" placeholder="Search..." style="flex:1;max-width:200px;padding:2px 8px;border:1px solid;border-radius:4px;font-size:12px;background:transparent;color:inherit;border-color:inherit;">
+          </div>
+          <div class="tile-demo-content">Custom header slot with search input</div>
+        </dees-tile>
+      </div>
+    </dees-demowrapper>
+  `;
+};

ts_web/elements/00group-layout/dees-tile/dees-tile.ts

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+import {
+  customElement,
+  DeesElement,
+  html,
+  css,
+  cssManager,
+  property,
+  state,
+  type TemplateResult,
+} from '@design.estate/dees-element';
+import { demoFunc } from './dees-tile.demo.js';
+import { cssGeistFontFamily } from '../../00fonts.js';
+import { themeDefaultStyles } from '../../00theme.js';
+
+declare global {
+  interface HTMLElementTagNameMap {
+    'dees-tile': DeesTile;
+  }
+}
+
+/**
+ * dees-tile — the unified "rounded on rounded" tile frame.
+ *
+ * RESPONSIBILITIES (what this component owns):
+ *  1. Outer card — border, border-radius, background, overflow clipping
+ *  2. Flex column layout — stacking header / content / footer vertically
+ *  3. Content inset — the rounded inner area with border-top and border-bottom
+ *  4. Default heading — styled 32px heading text when no slot="header" is provided
+ *  5. Footer visibility — auto-hides footer area when slot="footer" is empty
+ *
+ * NOT RESPONSIBILITIES (what consumer components own):
+ *  - Header/footer height, padding, font-size, colors when using custom slots
+ *  - Content layout (absolute, flex, grid — consumer decides)
+ *  - Any semantic meaning of header/footer content
+ *
+ * The header and footer slots are BARE containers (just flex-shrink: 0).
+ * The slotted content fully controls its own appearance.
+ * Only the default heading fallback (.tile-heading) carries tile-level styling.
+ */
+@customElement('dees-tile')
+export class DeesTile extends DeesElement {
+  public static demo = demoFunc;
+  public static demoGroups = ['Layout'];
+
+  @property({ type: String })
+  accessor heading: string = '';
+
+  @state()
+  accessor hasFooter: boolean = false;
+
+  public static styles = [
+    themeDefaultStyles,
+    cssManager.defaultStyles,
+    css`
+      :host {
+        display: flex;
+        flex-direction: column;
+        font-family: ${cssGeistFontFamily};
+        color: ${cssManager.bdTheme('hsl(0 0% 3.9%)', 'hsl(0 0% 98%)')};
+      }
+
+      /* --- The frame --- */
+      .tile-outer {
+        position: relative;
+        flex: 1;
+        min-height: 0;
+        background: ${cssManager.bdTheme('hsl(0 0% 100%)', 'hsl(0 0% 3.9%)')};
+        border: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
+        border-radius: 8px;
+        overflow: hidden;
+        display: flex;
+        flex-direction: column;
+      }
+
+      /* --- Header: bare container, only the default heading gets styled --- */
+      .tile-header {
+        flex-shrink: 0;
+      }
+
+      .tile-heading {
+        height: 32px;
+        line-height: 32px;
+        padding: 0 16px;
+        font-size: 14px;
+        font-weight: 500;
+        letter-spacing: -0.01em;
+        color: ${cssManager.bdTheme('hsl(0 0% 20%)', 'hsl(0 0% 63.9%)')};
+      }
+
+      /* --- Content: the rounded inset --- */
+      .tile-content {
+        flex: 1;
+        position: relative;
+        border-radius: 8px;
+        border-top: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
+        border-bottom: 1px solid ${cssManager.bdTheme('hsl(0 0% 89.8%)', 'hsl(0 0% 14.9%)')};
+        overflow: hidden;
+      }
+
+      .tile-content.no-footer {
+        border-bottom: none;
+        border-bottom-left-radius: 0;
+        border-bottom-right-radius: 0;
+      }
+
+      /* --- Footer: bare container, consumer styles the slotted content --- */
+      .tile-footer {
+        flex-shrink: 0;
+      }
+
+      .tile-footer.hidden {
+        display: none;
+      }
+    `,
+  ];
+
+  public render(): TemplateResult {
+    return html`
+      <div class="tile-outer">
+        <div class="tile-header">
+          <slot name="header">
+            <div class="tile-heading">${this.heading}</div>
+          </slot>
+        </div>
+        <div class="tile-content ${!this.hasFooter ? 'no-footer' : ''}">
+          <slot></slot>
+        </div>
+        <div class="tile-footer ${!this.hasFooter ? 'hidden' : ''}">
+          <slot name="footer" @slotchange=${this.onFooterSlotChange}></slot>
+        </div>
+      </div>
+    `;
+  }
+
+  private onFooterSlotChange(e: Event) {
+    const slot = e.target as HTMLSlotElement;
+    this.hasFooter = slot.assignedNodes({ flatten: true }).length > 0;
+  }
+}

ts_web/elements/00group-layout/dees-tile/index.ts

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+export * from './dees-tile.js';