Task 165: Fix NaN Timestamp Links in Source Citations

Status: DONE

Problem

The parseTimestamp() function in templates.ts only handled simple MM:SS or HH:MM:SS formats. Source citations in transfer analyses sometimes use range timestamps (e.g., 02:22-04:09（航路ブリーフィング〜天王星脱出）) or timestamps with descriptive text. These produced NaN when split and parsed as numbers.

Affected pages (8 NaN links total):

• EP01: 1 link (00:00 - 19:20（全編）)
• EP02: 2 links (09:08 - 13:45, 16:38 - 18:30)
• EP05: 5 links (3 unique timestamps in main page + 2 detail sub-pages)

Fix

Updated parseTimestamp() to use a regex to extract the first MM:SS or HH:MM:SS pattern from the string, ignoring range delimiters, description text, and Japanese characters.

Tests Added

8 new tests:

• parseTimestamp: 5 tests for range formats, descriptions, and non-timestamp text
• timestampLink: 3 tests ensuring no NaN in YouTube/Niconico URLs for edge cases

Verification

• All 1447 unit tests pass
• 90 E2E tests pass
• Build produces 0 NaN links (previously 8)
• Correct seconds values: 02:22→142, 02:50→170, 20:27→1227, 09:08→548, 00:00→0