Optimize DB operations and add migration for tab ordering

[Copilot]

Addresses performance issues and data migration concerns from PR #252 review feedback. Multiple tabs with order=0 cause non-deterministic UI ordering on existing installations. Repository methods perform N individual DB calls instead of bulk operations.

Database Performance

• Bulk operations: Replace get()/put() loops with getAll()/putAll() in updateTabsOrder(), readEntries(), readTabs(), and getTab()
• Reduces DB round-trips from O(N) to O(1) for large collections

Tab Order Migration

• Detect duplicate order values on readTabs() and auto-migrate based on timestamp
• Preserves original creation order for existing installations
• Runs once transparently, no user action required

// Before: N individual reads
for (final id in entryIds) {
  final entry = await db.entrys.get(id);
}

// After: Single bulk read
final entries = await db.entrys.getAll(entryIds);

Error Handling

• Reorder operations: Check persistence success and revert UI on failure
• Delete operations: Only set isDeleted=true when repository confirms success
• Prevents UI/DB state divergence

JSON Compatibility

• Add @JsonKey(defaultValue: 0) to Tabs.order and TabsDTO.order
• Handles import of older export files missing the order field

Minor Fixes

• First tab now uses order=0 instead of order=1 (consistent 0-based indexing)
• Simplified controller disposal check in ReusableForm using hasListeners

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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I tried to connect to the following addresses, but was blocked by firewall rules:

• archives.flutterinstaller.com
  • Triggering command: /usr/bin/curl curl -fL REDACTED -o dart.zip (dns block)
• dart.dev
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• https://storage.googleapis.com/flutter_infra_release/flutter/587c18f873b8ab57330422bce09047420d9c7f42/dart-sdk-linux-x64.zip
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• https://storage.googleapis.com/flutter_infra_release/flutter/587c18f873b8ab57330422bce09047420d9c7f42/engine_stamp.json
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  • Triggering command: /tmp/flutter/bin/cache/dart-sdk/bin/dartvm /tmp/flutter/bin/cache/dart-sdk/bin/dartvm --resolved_executable_name=/tmp/flutter/bin/cache/dart-sdk/bin/dart --executable_name=/tmp/flutter/bin/cache/dart-sdk/bin/dart --verbosity=error --snapshot=/tmp/flutter/bin/cache/flutter_tools.snapshot --snapshot-kind=app-jit --packages=/tmp/flutter/packages/flutter_tools/.dart_tool/package_config.json --no-enable-mirrors /tmp/flutter/packages/flutter_tools/bin/flutter_tools.dart credential.helpe--norc (http block)
• https://storage.googleapis.com/flutter_infra_release/gradle-wrapper/fd5c1f2c013565a3bea56ada6df9d2b8e96d56aa/gradle-wrapper.tgz
  • Triggering command: /tmp/flutter/bin/cache/dart-sdk/bin/dartvm /tmp/flutter/bin/cache/dart-sdk/bin/dartvm --resolved_executable_name=/tmp/flutter/bin/cache/dart-sdk/bin/dart --executable_name=/tmp/flutter/bin/cache/dart-sdk/bin/dart --packages=/tmp/flutter/packages/flutter_tools/.dart_tool/package_config.json /tmp/flutter/bin/cache/flutter_tools.snapshot pub get --help b-cache/_temp/dils bash e /melos"},"l":{"v":"6.3.3","e":{"p":"melos","e":"melos"},"s":false,"fp":false,"p":"/home/REDACTED/ amp /tmp/flutter/bin/cache bash _engine_version.sh ,"g":{"v":"7.4.0bash bash /flutter _engine_version.get (http block)
  • Triggering command: /tmp/flutter/bin/cache/dart-sdk/bin/dartvm /tmp/flutter/bin/cache/dart-sdk/bin/dartvm --resolved_executable_name=/tmp/flutter/bin/cache/dart-sdk/bin/dart --executable_name=/tmp/flutter/bin/cache/dart-sdk/bin/dart --packages=/tmp/flutter/packages/flutter_tools/.dart_tool/package_config.json /tmp/flutter/bin/cache/flutter_tools.snapshot pub get sh hlytics_add_uplobash r-desktop-embedd/tmp/flutter/bin/internal/update_engine_version.sh rFVQAYY bash n/me�� while kill -0 8965; do sleep 1; done; kill -9 9033 chmod tnet/tools/git ice/multichoice"bash /bin/sh rgo/bin/bash mkdir (http block)
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• https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json
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• https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.27.3-stable.tar.xz
  • Triggering command: /usr/bin/curl curl -L -o flutter_stable.tar.xz REDACTED /usr/bin/head sh /usr/bin/git bootstrap head /usr/local/bin/b-q git _eng�� /cache bash /usr/local/.ghcup/bin/bash rFHBOHR/bin/analbash mkdir tnet/tools/bash unner/.pub-cachemelos:melos (http block)
• https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.38.9-stable.tar.xz
  • Triggering command: /usr/bin/wget wget -q REDACTED (http block)
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