[#2622] Hide bucket time in ramp tooltips

[CYX22222003]

Fixes #2622

Proposed commit message

Hide bucket time from ramp tooltips.

Format ramp tooltip dates as date-only values, because the timestamp
shown there represents the daily bucket start rather than an actual
commit timestamp.

Other information

This is a display-only frontend change. The underlying date values used
for filtering, ramp positioning, report generation, and JSON output are
left unchanged.

Tested with:

• .\gradlew.bat testFrontend -Pci
• .\gradlew.bat test --tests "reposense.commits.*" --tests "reposense.parser.LocalDateTimeParserTest"

[Copilot]

🟢 Approval recommended

The change is narrowly scoped to tooltip formatting and the corresponding Cypress assertions are updated to match the new display behavior.

Pull request overview

Updates RepoSense’s frontend ramp tooltip text to display only the bucket date (not the normalized bucket start timestamp), aligning tooltip semantics with daily/weekly contribution bucketing while keeping all underlying filtering and positioning logic unchanged.

Changes:

• Format ramp tooltip dates as date-only strings (e.g., 2019-07-24 instead of 2019-07-24T00:00:00) via a small helper in c-ramp.vue.
• Apply the same date-only formatting to weekly tooltip ranges (startDate till endDate).
• Update Cypress E2E assertions that check ramp slice title attributes to match the new tooltip format.

File summaries

File	Description
frontend/src/components/c-ramp.vue	Strips time portion from tooltip date strings for daily/weekly ramp tooltips.
frontend/cypress/tests/zoomView/zoomView_rampChart.cy.js	Updates expected ramp slice tooltip titles to date-only format.
frontend/cypress/tests/chartView/chartView_zoomFeature.cy.js	Updates expected ramp slice tooltip titles to date-only format.
frontend/cypress/tests/chartView/chartView_optimiseTimeline.cy.js	Updates expected ramp slice tooltip titles to date-only format.
frontend/cypress/tests/chartView/chartView_mergeCommits.cy.js	Updates selectors/expectations relying on ramp slice tooltip titles to date-only format.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 0
• Review effort level: Lite

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[Copilot]

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[damithc]

Thanks @CYX22222003 for the PR. Based on changes to the test files, this PR seems to achieve the intended outcome. No issues from my side.