Add HardwareCards component linking to sister hardware docs

Reusable Astro component placed on 6 pages, cross-linking to
nanovna-h.warehack.ing and nanovna-f.warehack.ing with cards
matching the NanoVNAFamily visual style.

src/components/HardwareCards.astro

@@ -0,0 +1,105 @@
+---
+/**
+ * Cross-link cards to NanoVNA hardware reference sites.
+ * Visual style matches NanoVNAFamily.astro from nanovna-h-docs.
+ */
+interface Props {
+  show?: 'both' | 'h' | 'f';
+  heading?: string | false;
+}
+
+const { show = 'both', heading = 'Hardware Reference' } = Astro.props;
+
+const showH = show === 'both' || show === 'h';
+const showF = show === 'both' || show === 'f';
+const singleCard = show === 'h' || show === 'f';
+---
+
+{heading && <h2>{heading}</h2>}
+
+<div class:list={['hardware-cards', { 'single-card': singleCard }]}>
+  {showH && (
+    <a href="https://nanovna-h.warehack.ing/" class="hw-card" rel="noopener">
+      <h3>NanoVNA-H</h3>
+      <span class="hw-range">600 Hz &ndash; 2 GHz</span>
+      <p>Open-source hardware reference. Firmware internals, calibration theory, 60 shell commands.</p>
+      <span class="hw-link">nanovna-h.warehack.ing &#8594;</span>
+    </a>
+  )}
+  {showF && (
+    <a href="https://nanovna-f.warehack.ing/" class="hw-card" rel="noopener">
+      <h3>NanoVNA-F V3</h3>
+      <span class="hw-range">1 MHz &ndash; 6 GHz</span>
+      <p>Extended-range hardware reference. Measurement guides, antenna testing, TDR, data export.</p>
+      <span class="hw-link">nanovna-f.warehack.ing &#8594;</span>
+    </a>
+  )}
+</div>
+
+<style>
+  .hardware-cards {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    gap: 1rem;
+    margin: 1.5rem 0 2rem;
+  }
+
+  .hardware-cards.single-card {
+    grid-template-columns: 1fr;
+    max-width: 480px;
+  }
+
+  @media (max-width: 768px) {
+    .hardware-cards {
+      grid-template-columns: 1fr;
+    }
+  }
+
+  .hw-card {
+    background: var(--sl-color-gray-6);
+    border: 1px solid var(--sl-color-gray-5);
+    border-radius: 10px;
+    padding: 1.25rem;
+    text-decoration: none;
+    color: inherit;
+    transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
+    display: flex;
+    flex-direction: column;
+  }
+
+  .hw-card:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
+    border-color: var(--sl-color-gray-3);
+  }
+
+  .hw-card h3 {
+    margin: 0;
+    font-size: 1.1rem;
+    color: var(--sl-color-white);
+  }
+
+  .hw-range {
+    display: inline-block;
+    font-size: 0.8rem;
+    font-weight: 600;
+    color: var(--sl-color-accent);
+    margin: 0.25rem 0 0.5rem;
+  }
+
+  .hw-card p {
+    font-size: 0.82rem;
+    color: var(--sl-color-gray-2);
+    line-height: 1.5;
+    margin: 0;
+    flex: 1;
+  }
+
+  .hw-link {
+    display: block;
+    font-size: 0.78rem;
+    font-weight: 600;
+    color: var(--sl-color-text-accent);
+    margin-top: 0.75rem;
+  }
+</style>

src/content/docs/getting-started/quickstart.mdx

@@ -4,6 +4,7 @@ description: Get mcnanovna running in 5 minutes
 ---
 
 import { Steps, Tabs, TabItem, Aside } from '@astrojs/starlight/components';
+import HardwareCards from '../../../components/HardwareCards.astro';
 
 ## Prerequisites
 
@@ -52,6 +53,8 @@ You should see device details like firmware version, serial number, and frequenc
 - [Explore all 91 tools](/mcnanovna/tools/)
 - [Multi-VNA measurements](/tutorials/multi-vna-basics/) — Use two VNAs together
 
+<HardwareCards heading="Learn Your Hardware" />
+
 ## Troubleshooting
 
 ### VNA not detected

src/content/docs/index.mdx

@@ -18,6 +18,7 @@ hero:
 
 import { Card, CardGrid, Tabs, TabItem } from '@astrojs/starlight/components';
 import { Image } from 'astro:assets';
+import HardwareCards from '../../components/HardwareCards.astro';
 import smithChart from '../../assets/screenshots/smith-chart.png';
 import swrTrace from '../../assets/screenshots/swr-trace.png';
 import lcMatch from '../../assets/screenshots/measure-lc-match.png';
@@ -102,6 +103,8 @@ Then ask your assistant to analyze your antenna, measure a filter, or run a 3D p
   </figure>
 </div>
 
+<HardwareCards heading="Hardware Documentation" />
+
 ## Example Prompts
 
 Once installed, try prompts like:

src/content/docs/mcnanovna/overview.mdx

@@ -4,6 +4,7 @@ description: MCP server for NanoVNA-H vector network analyzers
 ---
 
 import { Aside } from '@astrojs/starlight/components';
+import HardwareCards from '../../../components/HardwareCards.astro';
 
 mcnanovna gives LLMs direct control of NanoVNA-H vector network analyzers over USB serial. It exposes 91 MCP tools for frequency sweeps, S-parameter measurements, calibration, LCD capture, RF analysis, 3D antenna radiation pattern visualization, and multi-VNA coordination.
 
@@ -60,6 +61,8 @@ See [Multi-VNA Coordination](/mcnanovna/multi-vna/) for detailed tier comparison
 Other NanoVNA variants using the same USB serial protocol (VID 0x0483, PID 0x5740) should also work.
 </Aside>
 
+<HardwareCards heading={false} />
+
 ## Architecture
 
 ```

src/content/docs/reference/ham-bands.mdx

@@ -3,6 +3,8 @@ title: Ham Bands
 description: Amateur radio frequency band presets
 ---
 
+import HardwareCards from '../../../components/HardwareCards.astro';
+
 mcnanovna prompts accept ham band names as shortcuts for frequency ranges.
 
 ## Band Presets
@@ -66,6 +68,8 @@ calibrate(start_hz=144000000, stop_hz=148000000)
 
 Bands outside these ranges can't be measured directly.
 
+<HardwareCards heading="Hardware Details" />
+
 ## Harmonic Measurements
 
 For bands above the VNA's range, harmonics can sometimes be used:

src/content/docs/tutorials/antenna-analysis.mdx

@@ -4,6 +4,7 @@ description: Using mcnanovna to analyze antenna performance
 ---
 
 import { Tabs, TabItem, Aside } from '@astrojs/starlight/components';
+import HardwareCards from '../../../components/HardwareCards.astro';
 
 This tutorial covers common antenna analysis tasks using mcnanovna.
 
@@ -132,3 +133,5 @@ Say: "Show the radiation pattern for my dipole"
 This uses the S11 data to determine resonance and impedance, then generates an idealized 3D pattern.
 
 For measured patterns, see [3D Pattern Measurement](/tutorials/pattern-measurement/).
+
+<HardwareCards show="h" heading={false} />

src/content/docs/tutorials/calibration.mdx

@@ -4,6 +4,7 @@ description: SOLT calibration for accurate measurements
 ---
 
 import { Steps, Aside } from '@astrojs/starlight/components';
+import HardwareCards from '../../../components/HardwareCards.astro';
 
 Calibration removes systematic errors from VNA measurements. Without calibration, your readings will include errors from cables, adapters, and the VNA itself.
 
@@ -136,3 +137,5 @@ The NanoVNA will use the stored calibration. Note that calibration must match th
 <Aside type="caution">
 Calibration is only valid for the exact cables and adapters used during calibration. If you change anything in the signal path, recalibrate.
 </Aside>
+
+<HardwareCards show="h" heading={false} />