feat: add escrow milestone progress timeline

[xx7412421-cloud]

Description

Adds a reusable milestone progress timeline for escrow tranches and wires it into the escrow status view so users can see which payment portions are released, currently locked for review, or still locked for later milestones.

Related Issue

Closes #14

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)
• Documentation update
• Refactoring (no functional changes)

Changes Made

• Added MilestoneProgress with typed statuses for released, current locked, and locked tranches.
• Added responsive CSS module styles for the timeline, status rail, badges, and mobile stacking.
• Rendered the timeline inside the escrow panel with representative escrow milestone data.
• Added /escrow page so the existing Escrow navigation link opens the milestone status view.

Screenshots (if applicable)

Not captured in this environment.

Checklist

• My code follows the project's code style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have run npm run lint and fixed all issues
• I have run npm run typecheck with no errors
• I have run npm run build successfully
• I have tested my changes locally

Additional Notes

No new runtime dependencies were added. Local lint, typecheck, build, and browser testing could not be run because this desktop environment does not expose Node/npm on PATH, so CI should validate the branch.

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