Replace browser methods with custom modals, tech debt cleanup, improvements

[ussaama]

…cleanup on avatar/logo removal

• Replace all window.confirm() calls with ConfirmModal across 12 components: ChatAccordion (delete chat), ConversationDangerZone (delete conversation), ProjectDangerZone (delete project — now 2-step confirmation), ProjectPortalEditor (disable anonymization, delete custom topic), ProjectTagsInput (delete tag), LanguagePicker (change language during chat), ProjectConversationOverview (regenerate summary), ProjectLibrary (generate library), ProjectReportRoute (delete report), TemplatesModal (delete template), AccountSettingsCard (remove avatar), WhitelabelLogoCard (remove logo)
• Replace window.prompt() with InputModal in ChatAccordion (rename chat)
• Replace window.alert() / native alert() with toast notifications: PermissionErrorModal (microphone denied), VerifyEmail (invalid token), useCopyToRichText (clipboard failure)
• Add reusable ConfirmModal and InputModal components to common/
• Align template edit view buttons: Delete as subtle red button + Save as primary, in a right-aligned Group (matching ConfirmModal layout)
• Backend: delete orphaned Directus files when removing avatar or whitelabel logo (previously files were left behind)
• Backend: wrap blocking Directus calls in run_in_thread_pool for async safety
• Fix MarkdownWYSIWYG toolbar position to use CSS variable instead of hardcoded sticky, and set it from report editor context
• Minor formatting cleanups (line length, import ordering)
• Doc updates for future references

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