Assets for 2025 and fix EventTheme

[kinoppyd]

Features

• Update seed data
• Add 2025 assets ( ogp is a temporary placeholder)
• Fix EventTheme attributes, remove sub_color, accent_color and text_color as they are no longer supported

[Copilot]

Pull Request Overview

This PR updates the event assets for 2025 while removing the unsupported color attributes from EventTheme. The changes include removing validations and database columns for deprecated colors, updating seed data and routes to reflect the 2025 event, and adjusting frontend styles and configuration accordingly.

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
db/migrate/20250325095231_remove_useless_theme_colors.rb	Removes unsupported color columns from the event_themes table
db/seeds.rb	Updates event seed data to use 2025 and eliminates deprecated theme color attributes
config/routes.rb	Redirects the root path from 2024 to 2025
db/seeds/schedule.yml	Updates schedule events timing and keys to reflect new event dates
config/application.rb	Sets the application time zone to Tokyo
app/models/event_theme.rb	Removes validations for unsupported color attributes
db/schema.rb	Updates schema version and removes obsolete columns
app/views/components/_app_header.html.erb	Adopts CSS variable for main color in the header component
app/views/layouts/application.html.erb	Removes CSS variables for the no longer supported theme colors

Comments suppressed due to low confidence (2)

db/migrate/20250325095231_remove_useless_theme_colors.rb:3

• Consider adding a reversible migration block or explicit comments to clarify that removing these columns is intentional and irreversible, which will help during rollbacks if needed.

remove_column :event_themes, :sub_color, :string, default: "#EBE0CE"

db/seeds.rb:109

• [nitpick] Review the fallback value 'en & ja' to ensure it matches the expected language keys; using a single default language value may help avoid ambiguity.

language: presentation['language'].then { Schedule.languages.has_key?(_1) ? _1 : "en & ja" }.downcase