refactor: update devcontainer and Biome configuration (#27)

- Remove ESLint and Prettier in favor of Biome
- Configure Biome as default formatter for TS/JS/JSON/MD
- Add development helper extensions
- Update VSCode settings for Biome integration

Closes #27

.devcontainer/devcontainer.json

@@ -1,8 +1,8 @@
 {
   "name": "Finance App Development",
-  "image": "mcr.microsoft.com/devcontainers/typescript-node:1-20-bullseye",
-  "workspaceFolder": "/home/acedanger/dev/finance",
-  "workspaceMount": "source=${localWorkspaceFolder},target=/home/acedanger/dev/finance,type=bind,consistency=cached",
+  "image": "ghcr.io/acedanger/finance-devcontainer:latest",
+  "workspaceFolder": "/workspaces/finance",
+  "workspaceMount": "source=${localWorkspaceFolder},target=/workspaces/finance,type=bind,consistency=cached",
   "features": {
     "ghcr.io/devcontainers/features/git:1": {},
     "ghcr.io/devcontainers/features/docker-in-docker:2": {},
@@ -16,27 +16,39 @@
         "GitHub.copilot",
         "GitHub.copilot-chat",
         "ms-vscode.vscode-typescript-next",
-        "bradlc.vscode-tailwindcss"
+        "bradlc.vscode-tailwindcss",
+        "biomejs.biome",
+        "PKief.material-icon-theme",
+        "Gruntfuggly.todo-tree",
+        "humao.rest-client"
       ],
       "settings": {
         "editor.formatOnSave": true,
         "[typescript]": {
           "editor.formatOnSave": true,
-          "editor.defaultFormatter": null,
+          "editor.defaultFormatter": "biomejs.biome",
           "editor.codeActionsOnSave": {
-            "source.fixAll": true
+            "source.fixAll.biome": "explicit",
+            "source.organizeImports.biome": "explicit"
           }
         },
         "[javascript]": {
           "editor.formatOnSave": true,
-          "editor.defaultFormatter": null,
+          "editor.defaultFormatter": "biomejs.biome",
           "editor.codeActionsOnSave": {
-            "source.fixAll": true
+            "source.fixAll.biome": "explicit",
+            "source.organizeImports.biome": "explicit"
           }
         },
         "[astro]": {
           "editor.defaultFormatter": "astro-build.astro-vscode"
         },
+        "[json]": {
+          "editor.defaultFormatter": "biomejs.biome"
+        },
+        "[markdown]": {
+          "editor.defaultFormatter": "biomejs.biome"
+        },
         "typescript.updateImportsOnFileMove.enabled": "always",
         "editor.bracketPairColorization.enabled": true,
         "files.exclude": {
@@ -48,7 +60,14 @@
         "terminal.integrated.defaultProfile.linux": "bash",
         "mcp.servers.github": {
           "command": "docker",
-          "args": ["run", "-i", "--rm", "--env-file", "${containerWorkspaceFolder}/.devcontainer/.env", "ghcr.io/github/github-mcp-server"],
+          "args": [
+            "run",
+            "-i",
+            "--rm",
+            "--env-file",
+            "${containerWorkspaceFolder}/.devcontainer/.env",
+            "ghcr.io/github/github-mcp-server"
+          ],
           "env": {}
         }
       }
@@ -58,8 +77,9 @@
   "postCreateCommand": "npm install && npm run check",
   "remoteUser": "node",
   "mounts": [
-    "type=bind,source=${localEnv:HOME}/.ssh,target=/home/node/.ssh,readonly"
+    "type=bind,source=${localEnv:HOME}${localEnv:USERPROFILE}/.ssh,target=/home/node/.ssh,readonly"
   ],
+  "updateRemoteUserUID": true,
   "remoteEnv": {
     "GITHUB_PERSONAL_ACCESS_TOKEN": "${localEnv:GITHUB_PERSONAL_ACCESS_TOKEN}"
   },