Merge upstream PR #119: deep select (Cmd+hover)

[alexgorbatchev]

Summary

• Merges benjitaylor/agentation#119 by @stevysmith — adds deep select mode (Cmd/Ctrl+hover to pierce through overlays, empty wrappers, and opacity:0 elements)
• Adds comprehensive test coverage for the new feature (90%+ on all changed files)

What's included

• Deep select: hold Cmd (Mac) / Ctrl (Win) while hovering to select content underneath overlays
• Two-pass pierce algorithm: finds elements with direct text content first, falls back to smallest visible element
• Improved element identification: direct text content checked before class names
• Visual indicators: dashed highlight border and "⇣ deep select" label when pierce mode is active
• Demo page: animated deep select demo on the features page

Tests added

• deep-select.test.tsx — 13 tests for pierce mode (activation, two-pass algorithm, styling, click behavior, edge cases)
• element-identification.test.ts — 9 tests for direct text content preference
• react-detection.test.ts — tests for new Remotion/RefForwarding skip patterns

File	Statements	Branches	Functions
element-identification.ts	95.08%	85.32%	100%
react-detection.ts	94.23%	91.71%	100%
index.tsx	91.54%	86.26%	85.52%

Test plan

• All 825 tests pass
• Build succeeds
• 90%+ coverage on changed files

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