Add Group Details plugin (0.1.0)

[Stash-KennyG]

Summary

• Add Group Details UI plugin (plugins/GroupDetails) at version 0.1.0.
• On group list pages, each group card shows filtered total duration (left of scene count) and average vertical resolution (right), computed from GraphQL findGroup data.

Behavior (see README)

• Duration total: scenes with scene_index null or 0..89 for that group.
• Avg vertical: same eligibility, only scenes with duration > 600s; sum(height)/count, shown as NNNp.

Note

Upstream main already includes SmartResolve (#697) with sync no-refresh and unconditional Select Smart Resolve reload; this PR only adds Group Details on top of current upstream main.

Test plan

• Open /groups list and confirm stats appear on group cards flanking scene count.
• Spot-check groups with mixed scene_index and short vs long scenes against README rules.

Made with Cursor

[Stash-KennyG]

Not ready.