feat(ui): register dashboard strategy with HA 2026.5+ picker

[raman325]

Proposed change

Registers the LCM dashboard strategy via the new window.customStrategies API
introduced in Home Assistant 2026.5. On HA 2026.5+, Lock Code Manager
now appears directly in Settings → Dashboards → Add Dashboard, so users
don't have to manually create a blank dashboard, open the Raw configuration
editor, and paste YAML. The YAML path still works for older HA and for
customizing strategy options.

The registration is additive metadata — on HA < 2026.5 it's harmless (nothing
reads window.customStrategies), so no version gating is needed in code.

Only the dashboard strategy registers. The view and section strategies are
referenced from within YAML the user is already editing, so the new picker API
doesn't apply.

Wiki updates landed alongside this PR (separate repo): the install quick-start
now leads with the new flow, and the UI Strategies reference notes the picker
behavior.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.69%. Comparing base (ddda221) to head (65bc9bb).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

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Flag	Coverage Δ
typescript	95.07% <ø> (ø)

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[Copilot]

Pull request overview

Adds Home Assistant 2026.5+ dashboard-picker integration by registering Lock Code Manager’s dashboard strategy via the new window.customStrategies API, so users can create the dashboard directly from Settings → Dashboards → Add Dashboard while keeping YAML strategy support for older HA versions.

Changes:

• Register the LCM dashboard strategy in window.customStrategies (name/type/description/docs URL metadata).
• Add TypeScript global typing for window.customStrategies.
• Update README copy to describe the new one-click dashboard flow for HA 2026.5+.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
ts/main.ts	Defines strategy custom elements and registers the dashboard strategy metadata via window.customStrategies.
README.md	Updates UI & Dashboards section to mention HA 2026.5+ dashboard picker flow.
custom_components/lock_code_manager/www/generated/lock-code-manager.js	Regenerated frontend bundle containing the window.customStrategies registration.

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