🔨 Fix debug breakpoints not binding

[TheAfroOfDoom]

This PR re-enables debugging through VSCode's builtin debugger with breakpoints

before: setting a breakpoint in a .ts file wouldn't actually bind and the language server would not hit it

after: setting a breakpoint catches successfully and pauses the server when it is hit

before
after

explanation

since packages/vscode-extension's watch script was calling npm run build (instead of npm run build:dev), it was calling esbuild.mjs with the prod arg (instead of dev).

Spyglass/packages/vscode-extension/package.json

Lines 17 to 18 in 3f4cc12

	"build": {
	"command": "node esbuild.mjs prod",

this made esbuild not utilize our source maps, which broke the debugger

Spyglass/packages/vscode-extension/esbuild.mjs

Line 10 in 02952bf

const isDev = mode !== 'prod'

Spyglass/packages/vscode-extension/esbuild.mjs

Line 21 in 02952bf

sourcemap: isDev,

when we switch to "watch": "npm run build:dev --watch", it calls the esbuild script with dev instead

Spyglass/packages/vscode-extension/package.json

Lines 31 to 32 in 3f4cc12

	"build:dev": {
	"command": "node esbuild.mjs dev",

then source maps are enabled, and debug breakpoints work 🎉

---

supplementarily: some minor cleanup (surprised this isn't caught by the formatter/linter in CI)