Fix locked vault bypass loopholes

[editinghero]

Addresses multiple loopholes that allowed bypassing the locked folder security in both the web and Android apps.

Web app:

• Updates renderNavCounts and renderAnalyticsView to exclude locked notes when calculating tags and total word count if the vault is currently locked.

Android app:

• Updates the Intent.ACTION_VIEW handler in MainActivity.kt to check the isLocked state of the requested note and the vault's unlock status before navigating to the Edit Screen, preventing access via external intents.
• Updates Note.kt fromFirestoreV2Map to clear tags and imageUrls when parsing an encrypted note without the decryption key, ensuring plaintext metadata doesn't leak into the local SQLite database.

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PR created automatically by Jules for task 12666639188099626001 started by @editinghero

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[editinghero]

Merged locally into main in commit aa1eaae with additional security hardening and biometric cleanup.