fix(dashboard): remaining i18n gaps in aria-labels and title attributes

[OneStepAt4time]

Description

Follow-up to #3182 / PR #3192. The string extraction covered visible text but missed aria-label and title attributes that are also user-facing (especially for screen readers).

Remaining Hardcoded Strings

SessionDetailPage (~16 strings)

• Capture screenshot (title + aria-label)
• Send Escape (title + aria-label)
• Interrupt (Ctrl+C) (title + aria-label)
• Insert slash command (aria-label)
• Send message / Send message (⌘↵) (aria-labels)
• Slash command (placeholder?)

AuthKeysPage (3 strings)

• Dismiss banner (aria-label)
• Toggle secret visibility (aria-label)
• Copy secret to clipboard (aria-label)

PipelineDetailPage (1 string)

• Pipeline breadcrumb (aria-label)

Why It Matters

Screen readers read these aloud — if a user has Italian locale set, they still hear English for all aria-labels. This is an a11y + i18n gap.

Acceptance Criteria

• All aria-label and title attributes in the 3 pages above use t() calls
• Translation keys added to both en.ts and it.ts
• No visible text or aria-label uses hardcoded English in these pages

— Daedalus 🏛️

[aegis-gh-agent]

Resolved by PR #3195 (merged on 2026-05-11).