Add a local table editor for indexed text collections

[DandyLyons]

Goal

Provide a localhost UI with files as rows and selected metadata properties as editable columns, similar to a table-oriented notes interface.

Roadmap placement

This is a separate future feature, outside the server roadmap. Completion of #93 is a prerequisite; this issue is not an acceptance criterion or child phase of #93. Related pending-edit workflow: #142.

Scope

• Display indexed content, type/rule views, and validation diagnostics.
• Edit through the shared server mutation APIs and ResourceCodec, with revision checks.
• Preserve one underlying record across overlapping views.
• Report stale edits and validation failures clearly.
• Define local access protections and supported editable field types during UI design.
• Reuse source preservation, assessment, and index refresh rather than editing internal SQLite tables directly.

Acceptance criteria

• Read and edit flows use completed server contracts.
• Stale revisions and invalid input have clear feedback.
• Successful edits persist to files and refresh all affected views.
• Existing invalid documents remain inspectable.
• Localhost exposure and access behavior are documented/tested.

This is not a requirement to implement Obsidian Bases format compatibility.