homepage: add per-model input modalities to the LLM cards

Each LLM card now lists its accepted inputs as a line (Inputs: text · image ·
audio), sourced from the harness models.yml:
- frank-large: text (no vision projector)
- frank-medium: text, image (Gemma4 vision path)
- frank-small: text, image, audio (Gemma4 projector audio encoder; audio is
  not in models.yml's input list only because OMP's schema rejects it, but the
  endpoint accepts input_audio parts)

New .desc-inputs CSS + bare-mode reset; /docs model guide gains an Inputs line
per model. bats 30/30 + live render verified.

shared/homepage/style.css

@@ -80,6 +80,7 @@ body::before {
 .desc { color: var(--fg); margin: 8px 0; }
 .desc-role { color: var(--head); font-weight: bold; }
 .desc-spec { color: var(--fg); }
+.desc-inputs { color: var(--fg); }
 .desc-use { color: var(--dim); margin-top: 4px; }
 .links a { color: var(--link); text-decoration: underline; margin-right: 12px; }
 
@@ -108,6 +109,6 @@ html[data-bare="1"] body { background: #fff; color: #000; font-family: serif; te
 html[data-bare="1"] body::before { display: none; }
 html[data-bare="1"] .panel, html[data-bare="1"] .top, html[data-bare="1"] .foot { border-color: #000; background: none; }
 html[data-bare="1"] .badge, html[data-bare="1"] .name, html[data-bare="1"] .desc, html[data-bare="1"] .summary, html[data-bare="1"] .section-title { color: #000; }
-html[data-bare="1"] .desc-role, html[data-bare="1"] .desc-spec, html[data-bare="1"] .desc-use { color: #000; font-weight: normal; }
+html[data-bare="1"] .desc-role, html[data-bare="1"] .desc-spec, html[data-bare="1"] .desc-inputs, html[data-bare="1"] .desc-use { color: #000; font-weight: normal; }
 html[data-bare="1"] .section-title { border-color: #000; }
 html[data-bare="1"] .links a, html[data-bare="1"] .toggle, html[data-bare="1"] .foot a { color: #000; }