[Subtask] Add structured table views for nodes and edges

[oxy86]

Overview

Add table-style views for node and edge data so users can inspect, sort, filter, and edit graph data as structured records.

This is a core step toward making SocNetV usable as a structured data workflow tool in addition to a graph visualization and analysis application.

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Motivation

Many graph-editing and data-cleaning tasks are much easier in tabular form than through per-node dialogs.

Users need to be able to:

• inspect many nodes/edges at once
• sort by attributes
• search/filter rows
• edit values efficiently

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Scope

Node table

• one row per node
• columns for:
  • built-in node properties
  • custom attributes / metadata

Edge table

• one row per edge
• columns for:
  • source
  • target
  • weight
  • relation/type
  • custom attributes

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Expected Capabilities

• sort by column
• search/filter rows
• select row(s) and sync with graph selection
• edit cell values (incrementally, where supported)

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UI Suggestions

• dockable panel
• separate tabs:
  • Nodes
  • Edges

This should fit the current single-window architecture.

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Implementation Notes

• Build on:
  • [Subtask] Improve and unify node/edge attribute editing in the UI #224 Attribute editing UI
  • [Feature Request] Custom Attributes for Nodes and Edges (Incl. Dates) #96 Attribute system
• Keep model/view separation clean
• Avoid coupling table logic directly to rendering logic

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Edge Cases

• large graphs
• mixed attribute presence across rows
• type display / formatting
• multi-relational graphs

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Relation to Feature

Part of:
#223 Graph data editing and structured data workflows****