Fix da}/da) text objects picking the wrong block when the cursor is before a block

[DeepanshuPal]

Why

Fixes #264. With the cursor before any block, da} deleted the first closed block in the document (the inner while body in the issue's example) instead of the first block opened ahead of the cursor. da{ already picked the right one, and so does real Vim (checked against vim 8.2: da} and da{ both delete the outer block).

What changed

In the text-object code in packages/codemirror-vim-core/vim.js, when no enclosing pair is found it searches ahead for a bracket and selects around it. It searched for the typed character, so a typed } found the first closing }, which belongs to an inner block. It now searches for the opening bracket when a closing one was typed (), }, ], >), the same thing the opening forms already did. Three lines, no change when the cursor is inside a block.

Test plan

Added three tests in packages/codemirror-vim-core/test/vim_test.js (da{, da} and da) with the cursor before a block). Before the fix the da} and da) tests fail; after it:

pnpm test            # 714 passing (711 before + 3 new), 0 failing
pnpm --filter codemirror-vim-core run typecheck   # clean

Manual: doc f(a) { / while (x) { / y; / } / z; / } with the cursor at the start, press da}. Before: only the inner while block is removed. After: the whole outer block is removed, as in Vim.

AI assistance disclosure: this change was written with an AI coding assistant (Claude), noted in the commit trailers.

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