fix(config): handle write errors when updating schema in opencode config

[ShoeBoom]

What does this PR do?

fixes #8126

when opencode launches it will try to add "$schema": "https://opencode.ai/config.json" if it is not already there

If opencode is unable to write to config it crashes with this error

ran into this since my config is syslinked from nix-store and you cant write to nix-store

❯ opencode
EACCES: permission denied, open '/Users/usr/.config/opencode/opencode.jsonc'
    path: "/Users/usr/.config/opencode/opencode.jsonc",
 syscall: "open",
   errno: -13,
    code: "EACCES"

      at write (unknown:1:1)
      at load (src/config/config.ts:1167:19)
      at load (src/config/config.ts:1097:23)
      at src/config/config.ts:1064:23
      at resolveNetworkOptions (src/cli/network.ts:35:31)
      at src/cli/cmd/tui/thread.ts:119:31
      at processTicksAndRejections (unknown:7:39)

Could add logging to this, but since i don't think its a big issue it's best to just ignore.

alternatively instead of the error above you could show a nicer warning saying failed to add "$schema": "https://opencode.ai/config.json" to prompt the user to update their config manually

How did you verify your code works?

I looked at it

... fine i'll test it... , ran bun dev; launches fine with misconfigured config

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