Buying never takes the mouse off the game: number keys in the buy menu, and a rebuy #274

The buy panel now opens with the pointer still locked and is driven from the keyboard: every tile is printed with the key that presses it — the number row, 1–9 then 0 and -, left to right, because a CT's shelf is eleven tiles and a tile with no key on it is one you need the mouse for — and X buys last round's loadout again, in the order it was bought, as far as the money goes. src/client/loadout.ts is the new module behind that: it remembers a round's purchases, rolls them over on the round, steps over a gun you survived with and stops at the first thing the wallet cannot reach, saying what it bought or what it could not afford in one line — shown in the HUD's message line and in the panel's live region. Every purchase still goes through economy.buy and still only when canBuy says so.

Look at src/client/main.ts: openBuy no longer calls exitPointerLock or requestPointerLock, the focus lands on the shelf rather than on a tile (a focused tile is a tile Space presses, and Space is jump), and the frame now suppresses switchTo as well as fire while the panel is up, so the number row cannot also reach for a gun. Movement is still live — walking out of spawn while you buy is the point. src/pages/game.ts renders the panel's frame: #buyshelf, which buy.ts draws into and which is a named group that takes the focus, and #buysays, a server-rendered live region outside everything a redraw replaces, so a screen reader hears "Buy menu: $800 to spend…" and each purchase. The panel keeps its tiles as buttons — tab reaches them, 44px stands, and a thumb taps them exactly as before, including the new Rebuy control beside them.

Two things I changed rather than added: the test that pinned "opening the buy menu drops the lock on purpose" now pins the opposite, and with the panel no longer dropping the lock, a lock lost while it is open is a real loss — the panel closes and the match pauses. One consequence worth knowing: with the lock kept there is no cursor over the panel on a desktop, so a mouse click on a tile is for a pointer that is not locked (a phone, or before the lock is granted); the keyboard is the way in while you are playing. I did not add a pause button for touch or change the shelf's order or prices. The app bundle went 334 bytes over its raw ceiling, so both halves moved to 110,000 / 43,500 against a measured 103,334 / 40,719 from bun run scripts/build.ts. bun run test is green (1218 pass), and the digests did not move.

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Closes #153