style: Fix RuboCop lint errors - array spacing and percent literal delimiters

AUTO-FIXED BY RUBOCOP:
- app/services/tech_stack_parser.rb: Add spaces inside array brackets
  * blockchain: [ "Rust", "Solidity", "Move" ]
  * web: [ "JavaScript", "TypeScript", "HTML", "CSS", "SCSS" ]
  * backend: [ "Ruby", "Python", "Go", "Java", "Kotlin", "PHP" ]
  * mobile: [ "Swift", "Kotlin", "Dart" ]
  * infra: [ "Shell", "Dockerfile", "HCL" ]
  * data: [ "Python", "R", "Julia" ]
  * systems: [ "C", "C++", "Rust", "Go" ]

- config/initializers/content_security_policy.rb: Change %w() to %w[]
  * %w(script-src style-src) → %w[script-src style-src]

RUBOCOP STATUS:
✅ 37 files inspected, 0 offenses detected
✅ All code style checks passing

Author: rz1989s

app/services/tech_stack_parser.rb

@@ -3,13 +3,13 @@
 class TechStackParser
   # Language categorization based on usage patterns
   CATEGORIES = {
-    blockchain: ["Rust", "Solidity", "Move"],
-    web: ["JavaScript", "TypeScript", "HTML", "CSS", "SCSS"],
-    backend: ["Ruby", "Python", "Go", "Java", "Kotlin", "PHP"],
-    mobile: ["Swift", "Kotlin", "Dart"],
-    infra: ["Shell", "Dockerfile", "HCL"],
-    data: ["Python", "R", "Julia"],
-    systems: ["C", "C++", "Rust", "Go"]
+    blockchain: [ "Rust", "Solidity", "Move" ],
+    web: [ "JavaScript", "TypeScript", "HTML", "CSS", "SCSS" ],
+    backend: [ "Ruby", "Python", "Go", "Java", "Kotlin", "PHP" ],
+    mobile: [ "Swift", "Kotlin", "Dart" ],
+    infra: [ "Shell", "Dockerfile", "HCL" ],
+    data: [ "Python", "R", "Julia" ],
+    systems: [ "C", "C++", "Rust", "Go" ]
   }.freeze
 
   def initialize(repos = nil)

config/initializers/content_security_policy.rb

@@ -18,7 +18,7 @@
 
   # Generate session nonces for permitted importmap, inline scripts, and inline styles.
   config.content_security_policy_nonce_generator = ->(request) { request.session.id.to_s }
-  config.content_security_policy_nonce_directives = %w(script-src style-src)
+  config.content_security_policy_nonce_directives = %w[script-src style-src]
 
   # Automatically add `nonce` to `javascript_tag`, `javascript_include_tag`, and `stylesheet_link_tag`
   # if the corresponding directives are specified in `content_security_policy_nonce_directives`.