Refactor interaction handler into focused targeting/snapshot modules

[thymikee]

Problem

src/daemon/handlers/interaction.ts is currently ~830 LOC and carries multiple concerns: command routing, selector resolution, @ref handling, coordinate parsing, snapshot capture, and interaction recording.

Goal

Refactor interaction handler into focused internal modules while preserving interaction command behavior and replay selector-chain recording.

Proposed split

• src/daemon/handlers/interaction-targeting.ts
  • coordinate target parsing + @ref target resolution + rect normalization
• src/daemon/handlers/interaction-snapshot.ts
  • session snapshot capture and related helpers
• src/daemon/handlers/interaction-flags.ts
  • ref snapshot flag guard + validation helpers
• Keep src/daemon/handlers/interaction.ts as command-level orchestration.

Acceptance criteria

• Selector + @ref behavior remains unchanged.
• Recorded actions still contain expected selectorChain metadata.
• No command routing moved into src/daemon.ts.
• New files target <=300 LOC when practical.
• Existing interaction and replay-heal tests pass unchanged.

Validation

• pnpm typecheck
• pnpm test:unit
• pnpm test:smoke