Outline item action buttons in orange and put icons on common verbs

[ctoth]

Kael asked for the item action buttons to look more like actions, suggested orange, and asked about icons.

What changes

• Orange outline. Item action buttons are an orange border and orange text, and fill solid orange on hover and press. A solid fill was tried first and was too heavy on real items: the coffee table in The Parlor lists 18 verbs.
• Icons on common verbs. ItemAction now carries the bare verb name, and ItemCard shows an icon beside the label for sit, lie, take, remove, put, open, close, give, drop, bolt and unbolt. Other verbs stay text-only. The icon is aria-hidden; the button's accessible name is unchanged.
• Button text colour. --color-text-button was used by the item and player card buttons but never defined, so it fell back to white on bright fills (1.74:1 on the old green item buttons). It is now defined as the dark inverse text colour. This also changes the player card's Page / Say To / Look / Follow text from white to dark (1.67–2.72:1 before, 6.7–11:1 now); their fills are unchanged.

Contrast

Pair	Ratio
Orange text and border on the card background	7.64
Dark text on orange (hover)	8.11
Dark text on pressed orange	5.15

Checked

• vitest run src/itemActions.test.ts src/components/ItemCard.test.tsx: 8 passed, including a new test that a known verb gets a hidden icon and an unknown one gets none.
• tsc --noEmit clean.
• In the dev client as a guest: the coffee table's 18 buttons render outlined, 12 with icons, and hover fills solid. The player card buttons are readable.

Not checked

• The Inventory tab's card (the guest carries nothing). It is the same component.
• Items other than the coffee table; three other rooms had nothing on the ground.