[AlexAndBear]

Description

Improves readability and consistency of the account pages.

• Settings tables use two columns: descriptions moved below the setting name as dimmed text
• Every account page has a larger headline with a dimmed subtitle
• "Account Information" page renamed to "Profile", with a separate "Account information" section
• Profile picture moved out of the table into its own card, avatar aligned left
• Calendar values shown below their labels
• More vertical spacing in table cells, table headers aligned with their columns
• Tables use the full width on smaller viewports
• Labels next to notification checkboxes are shown up to the tablet breakpoint
• New AccountHeading and AccountLabel components replace duplicated markup

Related Issue

• Fixes <issue_link>

How Has This Been Tested?

• test environment: local, macOS
• test case 1: pnpm test:unit --run for account pages, account components and avatar upload
• test case 2: pnpm lint, pnpm format:check, pnpm check:types

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)