typehints-gp(css[code-chip]) Restore Furo chip styling on field-list code; pin to 0.8125rem

why: External CSS expert recommendation #4. The previous
neutralisation rule (`.field-list code.literal { background:
transparent; padding: 0; border: none; font-size: inherit }`)
existed to stop Furo's percentage chip rule from compounding to
~10.5 px when the field body was pinned to 13 px. Now that
field-body is back at metadata-size (14 px) — see commit FE1 — a
13 px chip with light-gray background and padding **is** the right
size: it acts as a cognitive container around each type identifier
without overwhelming the row.

what:
- Delete the chip-strip block (background/padding/border/font-size
  all reset to inherit). Furo's `code.literal { background: var(...);
  padding: 0.1em 0.2em; border-radius: 0.2em; font-size: 81.25% }`
  rule now fires unmodified for inline code in field-list rows.
- Add a single-line size pin: `.field-list code.literal { font-size:
  0.8125rem }`. This overrides Furo's percentage size with a root-
  relative rem so chips render at ≈13 px regardless of the row's
  metadata-size parent. Without the pin, 14 px parent × 81.25 % =
  ~11.4 px (too small).
- Keep `.default_value code.literal { font-size: inherit; ...}` —
  signature default-value surface, different cascade, unaffected.

verification: at 1280 px on the typehints-gp examples page,
getComputedStyle('dl.field-list code.literal') returns fontSize
13 px, fontFamily "IBM Plex Mono", backgroundColor rgb(248, 249, 251)
(Furo's --color-background-secondary), borderTopLeftRadius 2.6 px,
paddingTop 1.3 px, paddingLeft 2.6 px (Furo's 0.1em 0.2em).

Author: tony

packages/sphinx-autodoc-typehints-gp/src/sphinx_autodoc_typehints_gp/_static/css/typehints_gp.css

@@ -43,13 +43,16 @@
    * up monospace from Furo's `code.literal` rule in
    * gp-furo-theme/.../code.css; no extra rule needed here. */
 
-  /* Defensive: blocks Furo's `code.literal { font-size: 81.25% }`
-   * from compounding inside field-list rows.  Keeps inline xref
-   * code at the row's inherited size instead of shrinking on top. */
+  /* Furo's `code.literal` chip styling (background, padding,
+   * border-radius) acts as a cognitive container around each type
+   * identifier — preferred to a transparent inline link.  Pin the
+   * size to a root-relative `0.8125rem` so chips render at ≈ 13 px
+   * regardless of the row's metadata-size parent.  Furo's own
+   * `code.literal { font-size: 81.25% }` would otherwise compound
+   * to ~11.4 px against a 14 px parent (too small); using `rem`
+   * blocks the compounding while still scaling with the root clamp
+   * ramp on wide viewports. */
   .field-list code.literal {
-    background: transparent;
-    border: none;
-    padding: 0;
-    font-size: inherit;
+    font-size: 0.8125rem;
   }
 }