feat: UI refinements, advanced search, drag-drop, manual uploads, and Google Drive folder syncing

[effands]

Overview

This Pull Request introduces multiple feature expansions, user interface refinements, bug fixes, and deeper Google Drive API integrations.

Key Changes

1. Google Drive Folder & File Integration

• Google Drive Folder mapping: Virtual folders in the app are now backed by real Google Drive folders. Creating, renaming, or deleting folders in the dashboard dynamically creates, renames, and deletes corresponding folders on Google Drive.
• Self-Healing Syncing: Added backend routines to automatically create and sync Google Drive folders for pre-existing folders in the database.
• Direct Google Drive Link Sharing: "Copy Link" and "Share Link" actions now copy the actual Google Drive sharing URL (https://drive.google.com/open?id=...) for files and folders.
• Subfolder uploads: Uploading files inside a virtual folder now streams them directly into their corresponding Google Drive folder.
• Recursive Sync: Re-engineered folder sync to recursively fetch files across all virtual subfolders, mapping them back to database folder IDs based on parent metadata.

2. Features & UX Enhancements

• Activity Log Page: Added a /activity route and log page showing user actions (uploads, deletions, and folder creations) with badge indicators.
• Advanced Search Filters: Integrated an advanced search dropdown in the header supporting File Kind, Connected Account, Size boundaries, and Date constraints.
• Drag & Drop Folder Movement: Enabled moving selected files into virtual folders by dragging and dropping them onto folder cards.
• Manual Storage Account Selection: Added a target account selection dropdown inside the "Upload File" modal, enabling manual routing overrides.
• Active Folder Upload Bug Fix: Fixed a bug to ensure files uploaded while inside a folder land in that folder.

3. Styling & Layout Refinements

• Orange Selection Highlights: Added a soft, transparent orange background and border for selected files and folders.
• Compact Layouts: Reduced globally large margins and spacing to make the dashboard layout tighter and more space-efficient.
• Refined Borders: Changed thick white separator lines on tables to thin, semi-transparent gray borders.
• Clean Checkboxes: Excluded checkboxes from text input style overrides, restoring their clean native browser look.