fix: parse embedded token amounts and parenthesized UTC times

[deKibi]

Fix parsing for converter expressions embedded inside long text messages.

Changes

• Support optional token / tokens suffixes after crypto tickers, e.g. 250 AEON tokens.
• Support parenthesized named timezones, e.g. 10:00 (UTC).
• Add regression coverage for the Binance Alpha announcement text containing both crypto and time converter matches.

[deKibi]

@codex Please verify that this PR correctly parses both 250 AEON tokens and 10:00 (UTC) from the provided long Binance Alpha message, and that existing crypto/time converter formats, handler priority, and deduplication behavior remain unchanged.

Binance Alpha example message:

Binance Alpha is the first platform to feature AEON (AEON), with Alpha debut and trading starting on July 27, 2026, at 10:00 (UTC). 

Users with at least 245 Binance Alpha Points can claim an airdrop of 250 AEON tokens on a first-come, first-served basis. If the reward pool is not fully distributed, the score threshold will automatically decrease by 5 points every 5 minutes.

Please note that claiming the airdrop will consume 15 Binance Alpha Points. Users must confirm their claim on the Alpha Events page within 24 hours; otherwise, it will be deemed that users have given up claiming the airdrop.

The same behaviour expected in other similar examples
Check for regressions according this feature

[chatgpt-codex-connector]

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[deKibi]

Closing this PR because it combines two separate scopes. The time parsing fix will be moved to a dedicated PR, while AEON support requires a separate decision around the existing market-cap rank guardrail.