fix: restore zone recovery for renamed entities and handle initialization timing

[miguelangel-nubla]

Description

Problem

When revisiting the zone-mapper-card, previously created zones failed to restore and draw on the canvas under the following conditions:

1. Home Assistant or the integration appends zone names to sensor entity IDs (e.g. sensor.zone_mapper_office_zone_1_main_chair). The existing regex ^sensor\.zone_mapper_([a-z0-9_]+)_zone_(\d+)$ strictly anchored the end of the string, ignoring these entities.
2. updateZonesFromEntities attempted to fetch attributes via hardcoded lookup sensor.zone_mapper_${location}_zone_${id}, which returned undefined for renamed entities.
3. If this.canvas was not yet available during the initial set hass invocation, state restoration was skipped and never retried.

Solution

1. Updated discovery regex to allow optional trailing suffixes: /^sensor\.zone_mapper_([a-z0-9_]+)_zone_(\d+)(?:_.*)?$/.
2. Maintained a map of discovered zone states (discoveredZoneStates) to access entity attributes directly instead of reconstructing exact entity ID strings.
3. Ensured updateZonesFromEntities() triggers once both hass and canvas are ready.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Code quality improvements

Checklist

• I have read the CONTRIBUTING document
• I have updated the documentation accordingly
• I have updated the translations if needed

[coderabbitai]

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_{Comment @coderabbitai help to get the list of available commands.}

[miguelangel-nubla]

I believe this might be impacted by HA new entity ID format in latest releases, for me the change to trigger the issue was to click the reset entity id on entity binary_sensor.office_zone_2_presence, that then became binary_sensor.office_zone_2_presence_office

This might need a bigger architectural change, relying on entity ids is very fragile.