[FEAT] Implement cycles page

[martian56]

Description

This PR implements the Cycles page

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Improvement (change that would cause existing functionality to not work as expected)
• Code refactoring
• Performance improvements
• Documentation update

Closes #30

[Copilot]

Pull request overview

Implements the Cycles page end-to-end by expanding the UI (list + active-cycle insights, create/edit/delete flows, filters, favorites) and aligning backend cycle status behavior with date-derived “Plane-style” statuses.

Changes:

• Added Cycle CRUD support in the UI (service + Create/Edit modals) and implemented the Cycles page UI with filtering + insights.
• Introduced local “favorite cycles” (localStorage + cross-component eventing) and surfaced favorites in the sidebar.
• Updated backend cycle status to be computed from start/end dates on List/Get/Create/Update.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
ui/src/services/cycleService.ts	Adds Cycle create/update/delete + listIssueIds API calls for the new Cycles UI.
ui/src/pages/ModulesPage.tsx	Minor UI tweak to module name styling (removes hover underline).
ui/src/pages/CyclesPage.tsx	Replaces placeholder with full Cycles page: active-cycle section, upcoming/completed lists, favorites, edit/delete actions, filtering event handling.
ui/src/lib/projectCyclesEvents.ts	Adds window event constants to sync cycles filtering/refresh across header + page.
ui/src/hooks/useCycleFavorites.ts	Implements localStorage-backed cycle favorites with a global change event.
ui/src/components/layout/Sidebar.tsx	Loads and displays favorite cycles in the favorites section; listens for cycle favorites changes.
ui/src/components/layout/PageHeader.tsx	Adds Cycles-specific Filters dropdown and “Add cycle” button; dispatches filter/refresh events; mounts CreateCycleModal.
ui/src/components/layout/AppShell.tsx	Adjusts main content padding for the Cycles page layout.
ui/src/components/UpdateCycleModal.tsx	Adds modal for editing a cycle (title/description/date range) via cycleService.update.
ui/src/components/CreateCycleModal.tsx	Adds modal for creating cycles (project selection + fields) via cycleService.create.
ui/package.json	Bumps UI version to 0.5.0.
ui/package-lock.json	Updates lockfile version metadata to 0.5.0.
api/internal/service/cycle.go	Computes cycle status from start/end dates during reads and after create/update.
api/internal/model/cycle.go	Changes cycle JSON tags for start/end dates (removes omitempty).
api/internal/handler/cycle.go	Enhances cycle date parsing to accept RFC3339 timestamps and date-only strings.

Files not reviewed (1)

• ui/package-lock.json: Language not supported

Comments suppressed due to low confidence (2)

api/internal/handler/cycle.go:31

• parseOptionalTime returns nil when parsing fails, which means invalid start_date/end_date values are silently treated as “not provided” (e.g. Create would succeed and produce a draft cycle). Consider returning an error from the parser and responding with 400 (similar to IssueHandler’s date validation) so clients get clear feedback on malformed dates.

func parseOptionalTime(s string) *time.Time {
	if s == "" {
		return nil
	}
	// Try RFC3339 first (full timestamp), then date-only YYYY-MM-DD
	t, err := time.Parse(time.RFC3339, s)
	if err == nil {
		return &t
	}
	t, err = time.Parse("2006-01-02", s)
	if err != nil {
		return nil
	}
	return &t

api/internal/service/cycle.go:149

• Cycle Update still accepts a status argument, but the service no longer applies it (status is recomputed from dates). This creates an API footgun where clients can send status and get it ignored. Either remove/ignore status at the handler level (don’t bind/forward it) or make the service signature not accept it and/or return 400 if a status is provided.

func (s *CycleService) Update(ctx context.Context, workspaceSlug string, projectID, cycleID uuid.UUID, userID uuid.UUID, name, description, status string, startDate, endDate *time.Time) (*model.Cycle, error) {
	cy, err := s.Get(ctx, workspaceSlug, projectID, cycleID, userID)
	if err != nil {
		return nil, err
	}
	if name != "" {
		cy.Name = name
	}
	if description != "" {
		cy.Description = description
	}
	if startDate != nil {
		cy.StartDate = startDate
	}
	if endDate != nil {
		cy.EndDate = endDate
	}

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