feat: support multiple file uploads in bucket

[premtsd-code]

Summary

• Allow selecting and dropping multiple files at once when uploading to a storage bucket
• Files upload in parallel with a concurrency limit of 5 to avoid overwhelming browser/server
• Drag-and-drop multiple files directly onto the bucket file list page for quick uploads
• Custom file ID option only shown when a single file is selected
• Wizard title and notification messages adapt to file count

Test plan

• Navigate to a bucket → click "Create file" → select multiple files via file picker → verify all upload and appear in list
• Navigate to a bucket → drag and drop multiple files onto the file list → verify all upload
• Upload > 5 files → verify concurrency is capped (only ~5 active at a time in network tab)
• Verify upload progress box shows all files with correct status

Before:

After:

[greptile-apps]

Greptile Summary

This PR adds multi-file upload support to storage buckets — both via the file picker wizard and full-page drag-and-drop — with a concurrency limit of 5 parallel uploads. All three issues flagged in prior review threads (failed-upload status tracking, silently swallowed per-file errors, missing drag-drop extension validation) have been addressed in this revision.

Confidence Score: 5/5

Safe to merge; all prior P1 findings are resolved and the only remaining finding is a low-priority edge case.

All three previously flagged P1 issues are now fixed: failed uploads are marked in the store, per-file errors surface notifications in both the wizard and drag-drop paths, and drag-drop validates extensions before uploading. The one remaining comment is a P2 edge case (case-sensitive extension comparison) that would only affect buckets whose admins stored extensions in non-lowercase form, which is non-default Appwrite behaviour.

src/routes/(console)/project-[region]-[project]/storage/bucket-[bucket]/+page.svelte — minor case-sensitivity issue in the manual extension filter inside handleDrop.

Important Files Changed

Filename	Overview
src/lib/stores/uploader.ts	Adds uploadFiles with concurrency-limited (5 parallel) batch uploading; failed uploads now correctly marked as 'failed' with an error message in the store.
src/routes/(console)/project-[region]-[project]/storage/bucket-[bucket]/create/+page.svelte	Multi-file selection and upload support added; per-file failures are now surfaced via addNotification; custom file ID restricted to single-file uploads.
src/routes/(console)/project-[region]-[project]/storage/bucket-[bucket]/+page.svelte	Adds full-page drag-and-drop with extension validation, concurrency-limited batch upload, and failure notifications; minor case-sensitivity edge case in manual extension comparison.

_{Reviews (4): Last reviewed commit: "Revert "refactor: move MAX_CONCURRENT_UP..." | Re-trigger Greptile}

[greptile-apps]

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