Support nested serverFolder paths with automatic creation

[clemenstyp]

Summary

This PR extends how the serverFolder is resolved when building the
bookmarks tree.

Until now, the code only looked for a single top-level collection whose
name exactly matched serverFolder. If none was found, it created one
flat root collection. Nested folder paths were not supported.

Changes

• Exact match first: Keeps the existing behavior of matching the full
  serverFolder name against a root-level collection.
• Path resolution fallback: If no exact match exists, serverFolder
  is split on / and each segment is resolved sequentially from the root
  downwards. The parent of each segment must be the previously matched
  collection.
• Auto-creation of missing segments: Any segment that does not yet
  exist is created via POST /api/v1/collections (with the correct
  parentId) and added to the local collection list so buildTree can
  use it.
• isRoot handling: The deepest (target) collection is always passed to
  buildTree with isRoot = true.

Behavior

Case	Result
Full name exists as root	Used directly
Path partially exists (e.g. a/b exists, c missing)	a, b reused, c created
Path does not exist at all	All segments created sequentially

Notes

• Parent comparisons are normalized to strings to avoid number/string
  mismatches.

[marcelklehr]

Awesome! Thanks for the contribution!

[Copilot]

Pull request overview

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Extends serverFolder resolution to support nested collection paths, creating missing Linkwarden collections on demand when building the bookmarks tree.

Changes:

• Keeps existing exact root-level name match for serverFolder.
• Falls back to resolving /-delimited path segments from the root downward.
• Auto-creates missing collections with correct parentId and updates the in-memory collections list.

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[marcelklehr]

Thank you!