fix: add accountId support to languages, pr-breakdown, weekly-summary, issues routes and components

[ionfwsrijan]

Description

Fixes #1310

Adds \accountId\ support to 4 API routes and 4 frontend components that were ignoring the selected GitHub account, causing half the dashboard to show data for the wrong account when switching accounts.

API Routes Fixed

• /api/metrics/languages\ — resolves account-specific token and \github_login\
• /api/metrics/pr-breakdown\ — resolves account-specific token (@me\ follows the token)
• /api/metrics/weekly-summary\ — resolves account-specific token and login
• /api/metrics/issues\ — resolves account-specific token

Components Fixed

• \IssueMetrics\ — reads \selectedAccount\ from \useAccount(), passes \�ccountId\ in fetch URL
• \WeeklySummaryCard\ — reads \selectedAccount\ from \useAccount(), passes \�ccountId\ in fetch URL
• \LanguageBreakdown\ — reads \selectedAccount\ from \useAccount(), passes \�ccountId\ in fetch URL
• \PRBreakdownChart\ — reads \selectedAccount\ from \useAccount(), passes \�ccountId\ in fetch URL

Pattern Used

Follows the same pattern as existing \contributions\ and \streak\ routes: when \�ccountId\ query param is provided and differs from the session's \githubId, the route resolves the app user, fetches the linked account's token (and login where needed) from \user_github_accounts\ via \getAccountToken, and uses those credentials for GitHub API calls.

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[ionfwsrijan]

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