add Claude Code hooks for formatting and notifications (#7767)

* feat: add Claude Code hooks for formatting and notifications

- Add PostToolUse hooks to auto-format files after Edit/Write:
  - format-frontend.sh: runs prettier on frontend files
  - format-backend.sh: runs rustfmt on backend Rust files
- Add Notification hook to alert user when Claude needs input
- Add edition=2021 to rustfmt.toml for proper parsing
- Update .gitignore for symlinked cache directories
- Add additional bash permissions for cargo check and npm scripts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* remove echo

* notification when in ssh as well

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.claude/hooks/format-backend.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# Format backend Rust files with rustfmt after Claude edits them
+
+# Get the file path from the tool result (passed via stdin as JSON)
+INPUT=$(cat)
+FILE_PATH=$(echo "$INPUT" | jq -r '.tool_input.file_path // empty')
+
+# Exit if no file path
+if [ -z "$FILE_PATH" ]; then
+    exit 0
+fi
+
+# Check if the file is in the backend directory and is a Rust file
+if [[ "$FILE_PATH" == *"/backend/"* ]] && [[ "$FILE_PATH" =~ \.rs$ ]]; then
+    cd "$CLAUDE_PROJECT_DIR/backend" || exit 0
+    # Run rustfmt with config from rustfmt.toml (edition=2021)
+    rustfmt --config-path rustfmt.toml "$FILE_PATH" 2>/dev/null || true
+fi
+
+exit 0

.claude/hooks/format-frontend.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# Format frontend files with prettier after Claude edits them
+
+# Get the file path from the tool result (passed via stdin as JSON)
+INPUT=$(cat)
+FILE_PATH=$(echo "$INPUT" | jq -r '.tool_input.file_path // empty')
+
+# Exit if no file path
+if [ -z "$FILE_PATH" ]; then
+    exit 0
+fi
+
+# Check if the file is in the frontend directory
+if [[ "$FILE_PATH" == *"/frontend/"* ]]; then
+    # Check if it's a formattable file type
+    if [[ "$FILE_PATH" =~ \.(ts|js|svelte|json|css|html|md)$ ]]; then
+        cd "$CLAUDE_PROJECT_DIR/frontend" || exit 0
+        # Run prettier silently, don't fail the hook if prettier fails
+        npx prettier --write "$FILE_PATH" 2>/dev/null || true
+    fi
+fi
+
+exit 0

.claude/hooks/notify-user.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+# Notify user when Claude requires input (works on macOS and Linux)
+
+# Check if we're in an SSH session
+if [[ -n "$SSH_CLIENT" || -n "$SSH_TTY" || -n "$SSH_CONNECTION" ]]; then
+    # SSH session - use terminal bell
+    # If using VSCode, enable audible terminal bell for SSH sessions:
+    # Add the following to .vscode/settings.json:
+    #   "accessibility.signals.terminalBell": {
+    #     "sound": "on"
+    #   },
+    #   "terminal.integrated.enableVisualBell": true
+    printf '\a'
+else
+    # Local session - use native notifications
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+        osascript -e 'display notification "Claude is waiting for your input" with title "Claude Code" sound name "Glass"' 2>/dev/null || printf '\a'
+    elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
+        notify-send "Claude Code" "Claude is waiting for your input" 2>/dev/null || printf '\a'
+    else
+        printf '\a'
+    fi
+fi
+
+exit 0

.claude/settings.json

@@ -23,7 +23,11 @@
       "Bash(git log:*)",
       "Bash(git branch:*)",
       "Bash(git show:*)",
-      "Bash(git blame:*)"
+      "Bash(git blame:*)",
+      "Bash(cargo check:*)",
+      "mcp__ide__getDiagnostics",
+      "Bash(npm run generate-backend-client:*)",
+      "Bash(npm run check:*)"
     ],
     "deny": [
       "Read(.env)",
@@ -91,6 +95,34 @@
           }
         ]
       }
+    ],
+    "PostToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/format-frontend.sh",
+            "timeout": 30
+          },
+          {
+            "type": "command",
+            "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/format-backend.sh",
+            "timeout": 30
+          }
+        ]
+      }
+    ],
+    "Notification": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "\"$CLAUDE_PROJECT_DIR\"/.claude/hooks/notify-user.sh",
+            "timeout": 10
+          }
+        ]
+      }
     ]
   },
   "enabledPlugins": {

.gitignore

@@ -13,3 +13,9 @@ backend/.minio-data
 .aider*
 !.aiderignore
 rust-client/Cargo.toml
+
+# Symlinked cache directories (for git worktrees)
+backend/target
+frontend/node_modules
+typescript-client/node_modules
+frontend/.svelte-kit

backend/rustfmt.toml

@@ -1,3 +1,4 @@
+edition = "2021"
 max_width = 100
 use_small_heuristics = "Default"
 match_arm_leading_pipes="Preserve"